Animation only work once and gets stuck because of a "button"! Need help quickly as possible.

I hope someone can help me in this community!

I've created an animated menu, which is supposed to slide in and out of the player.

The menu animation gets stuck second time you try to open the menu. I found the reason after maaaaaany hours of testing. And the reason is a button! In my case the button is named "Om kurset". When I delete all the buttons, then the menu slides open and close perfectly repeatedly.

What am I doing wrong here?

I've attached my working file.