Frontend edit button not showing up on custom post type single

Hello
I created two custom post types through the metabox plugin. When I go to a single item from this custom post type the edit button on the top menu bar is not showing up: https://screenshots.firefox.com/QEpK40QPGYthGAWJ/katjavonruville.pp.works

I already switched theme and deactivated all plugings exept meta box plugins but there was the same issue.

What can I do to strike this problem?
Best
Lukas