For example combat, you'll eventually have a ton of potions. It worked fine earlier, with all the potions of the same type but different tiers being grouped together. But recently after upgrading some old potions, it turned into a mess.
At first I thought I needed to sort in the bank, but that didn't work.
As an example of what I'm talking about, I have DR potion I and IV at the top, but when I upgraded DR I to II and then III so I can turn them to IV, II and III are now stuck at the bottom.

Edit: Nvm, seems to work now. Just need to restart apparently. Probably.