[BUG] Separating additional stacks shows wrong numbers

Separating a stack of items doesn't cause any problems initially, but if you try to separate another stack of items afterwards, the game will show an incorrect number of items - the game uses the maximum number for the first stack on all subsequent stacks, instead. This is only a cosmetic bug, though, and the correct numbers show once you move the slider on the stack divide window.

Just to give an example: I have a stack of 10 Wisdom Scrolls and a stack of 5 Portal Scrolls in my inventory. Shift-clicking on the stack of Wisdom scrolls brings up the stack divide window, with the default split showing up as 9:1. If I were to Shift-click on the stack of Portal scrolls afterwards, the default split would show up as 9:1 even though the stack only contains 5 scrolls.