Confirmed - cause found, patch not written yet.

You are right, and my earlier change was wrong. Both tab states are meant to share a TOP edge with the unselected one simply shorter at the bottom, so nothing should cross the frame at all. I raised the selected tab instead. Correct seating is now measured from the artwork and ready to apply.

Moving it out of OPEN so the list reflects reality: this one is pinned down to exact files and lines, so what is left is writing and testing the change, not working out what is wrong.

Fixed in d482bd94.

Cause: my earlier attempt (2c60630d) seated those three tabs by fitting them against a screenshot, and the fit gave the selected and unselected states different tops (13 vs 16) and different heights (25 vs 18). So the selected tab started 3px higher than its neighbours and ran down to y37 - straight through the panel's top bar at y32-39, which is exactly what you flagged.

Fix: re-measured off the art instead of fitted to a picture. All six sprites are fully opaque rectangles, so the two states can be registered against each other by their own pixels. Comparing them top-aligned versus bottom-aligned, top-aligned wins on all three icons - they share a TOP edge, and the selected state is simply the same tab continued 7px further down. Neither sprite carries an origin offset in the WZ, and HeavenClient builds the pair the same way.

So both states now sit on one shared top edge, below the bar rather than through it.

Retest: open the Cash Shop preview and click between all three backgrounds, checking the selected one never crosses the bar.