diff --git a/library/components/poster/PosterWall.vue b/library/components/poster/PosterWall.vue
index 9a194bcd1..0fcda8c3e 100644
--- a/library/components/poster/PosterWall.vue
+++ b/library/components/poster/PosterWall.vue
@@ -787,9 +787,17 @@ useShadowStyles(
   // the row wraps to a second line in long-label locales (ro/ru measured at 2 lines).
   // A hard-coded 20px would tuck the size row under the print row in exactly those
   // locales. toggleDeck() reads the live offsetHeight and writes it to --pstocks-gap.
-  // Hangs below the footer sticker, which is itself half-overhanging the banner edge — so the
-  // offset starts at HALF the print row's height, not all of it.
-  '.pstocks{top:100%;margin-top:calc(var(--pstocks-gap,20px) / 2);width:92%;max-width:92%;' +
+  // ⚠ THE OFFSET IS THE FULL ROW HEIGHT MINUS A FIXED STICKER OVERHANG, NOT HALF THE ROW.
+  // It used to be `calc(var(--pstocks-gap) / 2)`, reasoning that the footer sticker half-overhangs
+  // the banner edge so half the row's height is the right clearance. That holds ONLY while the row
+  // is ONE LINE. On mobile it wraps to two, and half of a doubled height is no longer half a row —
+  // it lands squarely on the labels, so the size options covered the words "Card deck" themselves.
+  // Reported from mobile 2026-09-28.
+  // A FRACTION OF A VARIABLE HEIGHT IS THE BUG: the sticker's overhang is a CONSTANT (~11px), so
+  // subtracting a constant is correct at any number of lines, while halving is correct at exactly
+  // one. Same shape as the box-sizing error on the packet's table rows — a value that happens to be
+  // right at one size and is silently wrong at every other.
+  '.pstocks{top:100%;margin-top:calc(var(--pstocks-gap,20px) - 11px);width:92%;max-width:92%;' +
   'box-sizing:border-box;padding:3px;border-radius:2px;background:#fff;' +
   'display:flex;flex-wrap:wrap;gap:3px;justify-content:center;' +
   'box-shadow:0 1px 4px rgba(0,0,0,.10);cursor:default}' +