Fixed - they were being drawn in the wrong place entirely, which is why they looked wrong rather than just badly sized.

The three background-select buttons were positioned just below the preview box. That spot is not empty: the shop background has a chat-bubble icon and a long white text-entry strip baked into it there, so the buttons were sitting on top of that artwork.

They now sit on the top edge of the preview panel, to the right of the 'Preview' heading - the selected button's height finishes exactly on the last frame row before the preview area starts, which tucks the row onto the frame the way MapleStory's tab rows do.

There was a real sizing bug too, and you were right to call it out: the selected and unselected versions of these buttons are different heights (25px vs 18px), but both were being drawn and click-tested as if they were 25 tall. So the two unselected ones claimed 7 pixels of empty space above themselves. Each now uses its own height and sits on a shared baseline.

On the editor preview now; reaches the public build with the next publish.