diff --git a/components/StudyFeed.tsx b/components/StudyFeed.tsx
index 9735495..41cd792 100644
--- a/components/StudyFeed.tsx
+++ b/components/StudyFeed.tsx
@@ -49,7 +49,8 @@ export function StudyFeed({ deck }: { deck: Deck }) {
 
   const next = useCallback(() => goTo(index + 1), [goTo, index]);
 
-  // Track which slide is visible (works for wheel, touch and programmatic scroll).
+  // Track which slide is visible (works for wheel, touch and programmatic
+  // scroll). Re-attached whenever the scroller remounts on a new run (runId).
   useEffect(() => {
     const container = scrollRef.current;
     if (!container) return;
@@ -67,7 +68,7 @@ export function StudyFeed({ deck }: { deck: Deck }) {
       container.removeEventListener("scroll", onScroll);
       cancelAnimationFrame(frame);
     };
-  }, []);
+  }, [runId]);
 
   // Keyboard navigation.
   useEffect(() => {
@@ -262,7 +263,12 @@ export function StudyFeed({ deck }: { deck: Deck }) {
       </header>
 
       {/* Feed ------------------------------------------------------ */}
+      {/* The scroller remounts on every run (key={runId}) so it always
+          starts on the first slide with fresh scroll/snap state: a shrinking
+          queue or an interrupted smooth scroll can never leave the feed on a
+          stale, half-scrolled or blank position. */}
       <div
+        key={runId}
         ref={scrollRef}
         data-testid="study-feed"
         className="no-scrollbar h-full snap-y snap-mandatory overflow-y-scroll overscroll-y-contain [overflow-anchor:none]"
diff --git a/public/sw.js b/public/sw.js
index bfdc731..5dd4f88 100644
--- a/public/sw.js
+++ b/public/sw.js
@@ -9,7 +9,7 @@
  *
  * Bumping CACHE_VERSION is how a new deploy invalidates old assets.
  */
-const CACHE_VERSION = "freezmo-v18";
+const CACHE_VERSION = "freezmo-v19";
 const SHELL_CACHE = `${CACHE_VERSION}-shell`;
 const ASSET_CACHE = `${CACHE_VERSION}-assets`;