MTX's disappeared, and not under MTX Stash

I had some MTX's in my hideout, and now they are in a remove-only hideout tab.

I put one of them down in my hideout (from remove-only), trying to see if I could get it back into my MTX stash later, but then when I removed it from hideout, it just completely disappeared. It didn't go back to MTX stash, or back to hideout stash. Just poof! Gone. And this was my Rolling Head. =/

I want all these MTX's in my MTX's, so I can put them in my hideout or use them regularly next league. And I need my rolling head back, please.

Thanks.