2.5_403
The item selector goes to the wrong position when scrolling down from arrows to the letter (in the screenshot)
letter (mushroom) is item number 7 and down on arrows is set to 7.
I tried setting it to 8 as well yet it continues to go to 6 (bait) every time instead.
This subscreen was working perfectly at one point, and then corrupted in the b16.
It was imported into the 403 from the b16, and repaired and works correctly again except for this one issue.

Could you please post the quest?
I'll send you a PM with the address of where to grab it.
I've tracked down the problem. On your custom subscreen, there are three "current item" components in very close proximity: the bow and two arrows. One of these arrows is correct, the other, however, has the same position id (2), but has incorrect direction ids (in particular the down direction id is the bait.) The broken subscreen component in question has id 25; it is not possible to click on it directly, but you can select it by clicking on the bombs, then clicking the "next component" arrow.