menu displays under the title

I have a problem with the menu, when the title is enabled on a post or page in the Startup theme. The menu does not display above the title but under it, and it makes it so that menu items cannot be selected. (see screen shot)

The problem does not happen when the title is disabled.

Hello,

Could you provide an URL to your website? (here or via PM) then I'll be able to help you with that.