Broken post editor formatting display

Enabling Autoptimize seems to disable the display of the formatting toolbar in the front-end post editor. This occurs for all users. You can see the effect on this screenshot: https://www.naktiv.net/wp-content/uploads/mediapress/groups/15/228121/buddyblog-edit-display-with-no-controls-w-arrows-1024×682.png

The page I need help with: [log in to see the link]