Microtransactions not being re-claimed?

I don't know if this is a known problem? But I am experiencing problems with re-claiming mtx's? I hopped into global and asked around. And it would seem that I've "run out of space" for my mtx's? I didn't realize that you could "run out"...

Someone told me that I had to apply mtx's until I have enough space in the tab for the one I actually want to remove? I think it would have been nice if there were the ability to pickup the mtx's like you would with items and manually move them around in the tabs like in stash tabs. That way I'd be able to organize the tab so I could have room.

This just seems like an odd thing, like it'd be great if there was an error message that pops up stating you've run out of room in your mtx tabs which is the reason you can't re-claim a mtx.

So I went ahead and played a bit of tetris, and managed to "re-organize" the mtx tab and it's completely full now. Can't re-claim the skin on my bow.