diff --git a/app/src/ui/tutor/TutorTab.tsx b/app/src/ui/tutor/TutorTab.tsx
index 78dd3f7..234ab9d 100644
--- a/app/src/ui/tutor/TutorTab.tsx
+++ b/app/src/ui/tutor/TutorTab.tsx
@@ -206,8 +206,9 @@ export function TutorTab() {
   const log = useRef<HTMLDivElement>(null);
   /** The log follows new text while this is set; see the follow effect. */
   const stick = useRef(true);
-  /** Where the log was last scrolled to; see onLogScroll. */
+  /** Where the log was last scrolled to, and how tall it was; see onLogScroll. */
   const lastTop = useRef(0);
+  const lastHeights = useRef({ content: 0, box: 0 });
   const menuButton = useRef<HTMLButtonElement>(null);
 
   /* ── the keyboard's field, and answer mode ── */
@@ -716,15 +717,24 @@ export function TutorTab() {
      stream has added more than STICK_PX below it — judged by distance
      alone, that read as the learner scrolling away, and the log stopped
      following mid-reply. Growing content never moves scrollTop up; a
-     finger does. */
+     finger does.
+
+     And a finger does not change the log's height. Leaving answer mode
+     brings back the earlier messages, the composer and the nav in one
+     layout, which reset scrollTop to 0 — an upward jump that read as
+     scrolling away, just as the answer was sent. A move made while the
+     content or the box changed size is layout, not the learner. */
 
   const onLogScroll = useCallback(() => {
     const el = log.current;
     if (!el || !active) return;
     const top = el.scrollTop;
+    const resized =
+      el.scrollHeight !== lastHeights.current.content || el.clientHeight !== lastHeights.current.box;
     if (el.scrollHeight - top - el.clientHeight < STICK_PX) stick.current = true;
-    else if (top < lastTop.current - 1) stick.current = false;
+    else if (top < lastTop.current - 1 && !resized) stick.current = false;
     lastTop.current = top;
+    lastHeights.current = { content: el.scrollHeight, box: el.clientHeight };
   }, [active]);
 
   const follow = useCallback(() => {
@@ -732,6 +742,7 @@ export function TutorTab() {
     if (!el || !stick.current) return;
     el.scrollTop = el.scrollHeight;
     lastTop.current = el.scrollTop;
+    lastHeights.current = { content: el.scrollHeight, box: el.clientHeight };
   }, []);
 
   useEffect(() => {