Can't install cores

[cloudhead]

Describe the bug
I can't install any core due to a GUI bug.

To Reproduce
Pick the SNES core and click install.

If the error only appeared after installing a certain core or image pack say which one.

Expected behaviour
I can install the core.

Screenshots

See here there is no action I can take, , etc. don't do anything either.

Desktop (please complete the following information):

• OS: Arch Linux

Additional context
I use a tiling window manager, if that matters.
Resizing the window doesn't help.