Stash Tabs UI Bug

So I've been putting items in my stash tabs when realized I can't see the 1st tab in the drop-down menu of the tabs and I had to scroll back to it from the top side of the stash tabs. And after trying out several things to see what's happening I found out that when you click on the last tab in the drop-down menu all the tabs go one slot upward and the 1st tab in the list disappears from the drop-down menu.