(4.6 UI) Button is highlighted permanently

for with my Pause menu, I got another Bug: when I go into the submenu and back the first button is highlighted (mouseover) permanently. I use the standard Unity Button component. Here is a gif:
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Anyone an idea? Here is the project.

On each button, set “Navigation” to none. The “perma” selection is meant to be used if your UI supports keyboard input.

in your project select settings button and set navigation to automatic.

The solution to this was easy, make a new project in Unity 5 and rebuild it, I did everything excactly as before, I have no idea why it’s working now