diff --git a/web/src/reader/reader.ts b/web/src/reader/reader.ts
index aed9b15..d1af444 100644
--- a/web/src/reader/reader.ts
+++ b/web/src/reader/reader.ts
@@ -482,11 +482,14 @@ document.addEventListener("alpine:init", () => {
     tocItems: [] as any[],
     mediaItemId: "" as string,
     saveTimeout: null as ReturnType<typeof setTimeout> | null,
-    // Set only by deliberate navigation (page turns, jumps, slider). The
-    // restore at open time and section-load relocations never set it, so
-    // progress saves can only ever write a position the user actually
-    // moved to — never a stale restore clobbering a newer device push.
-    userMoved: false as boolean,
+    // Position last known to be stored (the restore at open time, or the
+    // last successful save). Relocations that don't move from it are never
+    // written back, so a restored position can't clobber a newer device
+    // push — while swipe/scroll paging (handled inside foliate, with no
+    // wrapper method to flag) still saves normally.
+    lastSyncedCfi: "" as string,
+    lastSyncedFraction: -1 as number,
+    lastCfi: "" as string,
     contextText: "" as string,
     readingTheme: "light" as string,
     readingMode: "light" as string,
@@ -883,6 +886,7 @@ document.addEventListener("alpine:init", () => {
         const { fraction, location, pageItem, cfi, tocItem, section } =
           e.detail;
         this.hideSelectionPopover();
+        this.lastCfi = cfi || "";
         this.lastRelocateDetail = {
           fraction,
           location,
@@ -944,6 +948,11 @@ document.addEventListener("alpine:init", () => {
       } else {
         await this.view.init({})
       }
+      // The position restored above (or the start of the book on a fresh
+      // open) is the baseline: only relocations that actually move from
+      // it may write progress.
+      this.lastSyncedCfi = this.lastCfi;
+      this.lastSyncedFraction = this.lastRelocateDetail?.fraction ?? -1;
       // The renderer only knows it's a PDF once frames exist (they carry
       // pdf.js onZoom), i.e. after init has rendered the first spread.
       // Read it now and apply the saved pointer mode — this also makes the
@@ -953,10 +962,15 @@ document.addEventListener("alpine:init", () => {
         this.renderer.setAttribute("interaction-mode", this.interactionMode);
       }
       this.fxZoomed = this.isFixedLayout && this.renderer?.zoom != null;
-      // A bfcache-resurrected page is stale by definition: forbid it from
-      // writing its frozen position back until the user navigates again.
+      // A bfcache-resurrected page is stale by definition: re-baseline to
+      // its frozen position so it can't write that back until the user
+      // actually navigates again.
       window.addEventListener("pageshow", (e: PageTransitionEvent) => {
-        if (e.persisted) this.userMoved = false;
+        if (e.persisted) {
+          this.lastSyncedCfi = this.lastCfi;
+          this.lastSyncedFraction =
+            this.lastRelocateDetail?.fraction ?? -1;
+        }
       });
       this.fetchReadingSpeed();
       this.refreshAnnotations();
@@ -1557,9 +1571,9 @@ document.addEventListener("alpine:init", () => {
       }
     },
     // Fresh reading position from the database — the single source of
-    // truth at open time. Fails soft to a fresh start: the userMoved gate
-    // guarantees merely opening (even at the wrong spot) can never
-    // overwrite the stored position.
+    // truth at open time. Fails soft to a fresh start: change detection
+    // against the restored baseline guarantees merely opening (even at
+    // the wrong spot) can never overwrite the stored position.
     async fetchSavedLocation(): Promise<{
       cfi?: string;
       page?: number;
@@ -1591,9 +1605,17 @@ document.addEventListener("alpine:init", () => {
       }
     },
     debouncedSaveProgress(fraction: number, location: any, cfi: string) {
-      // Only deliberate navigation writes progress: displaying a restored
-      // position must never overwrite a newer device push.
-      if (!this.userMoved) return;
+      // Only an actual change from the last stored position writes
+      // progress: displaying a restored position must never overwrite a
+      // newer device push. Swipes and scrolls are handled inside foliate
+      // with no wrapper method to flag, so position — not intent — is the
+      // signal. Books without CFIs (fixed layout, PDF) compare fraction.
+      const currentCfi = cfi || "";
+      const changed =
+        currentCfi || this.lastSyncedCfi
+          ? currentCfi !== this.lastSyncedCfi
+          : Math.abs(fraction - this.lastSyncedFraction) > 1e-4;
+      if (!changed) return;
       if (this.saveTimeout) clearTimeout(this.saveTimeout);
       this.saveTimeout = setTimeout(() => {
         this.saveProgress(fraction, location, cfi);
@@ -1644,6 +1666,8 @@ document.addEventListener("alpine:init", () => {
           },
           body: JSON.stringify(body),
         });
+        this.lastSyncedCfi = cfi || "";
+        this.lastSyncedFraction = fraction;
       } catch (_e) {
         // silent fail — progress save is non-critical
       }
@@ -1734,23 +1758,18 @@ document.addEventListener("alpine:init", () => {
       saveSettings({ double_page_spread: this.doublePageSpread });
     },
     goLeft() {
-      this.userMoved = true;
       this.view?.goLeft?.();
     },
     goRight() {
-      this.userMoved = true;
       this.view?.goRight?.();
     },
     nextPage() {
-      this.userMoved = true;
       this.view?.next?.();
     },
     previousPage() {
-      this.userMoved = true;
       this.view?.prev?.();
     },
     goToFraction(value: string) {
-      this.userMoved = true;
       this.view?.goToFraction?.(parseFloat(value));
     },
     toggleTOC() {
@@ -1929,11 +1948,9 @@ document.addEventListener("alpine:init", () => {
     },
     goToSearchResult(item: { cfi?: string; page?: number | null }) {
       if (item.cfi) {
-        this.userMoved = true;
         this.pushBackStack();
         this.view?.goTo?.(item.cfi);
       } else if (item.page != null) {
-        this.userMoved = true;
         this.pushBackStack();
         this.view?.goTo?.(item.page);
       } else return;
@@ -1962,7 +1979,6 @@ document.addEventListener("alpine:init", () => {
     goBackToLocation() {
       const loc = this.backStack.pop();
       if (!loc) return;
-      this.userMoved = true;
       if (loc.cfi) this.view?.goTo?.(loc.cfi);
       else if (typeof loc.page === "number") this.view?.goTo?.(loc.page);
     },
@@ -1978,7 +1994,6 @@ document.addEventListener("alpine:init", () => {
     },
     goToTOCItem(item: any) {
       if (this.view && item.href) {
-        this.userMoved = true;
         this.pushBackStack();
         this.view.goTo(item.href);
         this.tocOpen = false;
@@ -2106,7 +2121,6 @@ document.addEventListener("alpine:init", () => {
     },
     goToPage(index: number) {
       if (!this.view || typeof index !== "number" || index < 0) return;
-      this.userMoved = true;
       this.pushBackStack();
       this.view.goTo(index);
       this.tocOpen = false;
@@ -2114,11 +2128,9 @@ document.addEventListener("alpine:init", () => {
     goToBookmark(item: { cfi: string; page: number | null }) {
       if (!this.view) return;
       if (item.cfi) {
-        this.userMoved = true;
         this.pushBackStack();
         this.view.goTo(item.cfi);
       } else if (item.page != null && item.page > 0) {
-        this.userMoved = true;
         this.pushBackStack();
         // Fixed-layout/comic: sections are pages; foliate takes an index.
         this.view.goTo(item.page - 1);