Wired things when click a button on fullscreen

Hello!
I have a very simple scene with two buttons.
One for full screen and one simple button with up-over-down states
Full screen button works great,
Simple button works great too,
but gives me a bug ONLY in full screen mode.
When I click the simple button , shows me all button states(up-over-down)

I think this is very weird.
:hangover:
Easy or not?

Thanks