Strange problem with Dark Mode

I’m making a new website and happy with it so far, including the Dark Mode.

But there’s one problem: the mouseovers on the menu’s are fine in Light Mode and should be the same (but opposite) in Dark Mode. They are on the Preview, but not on the final test (instead of highlighted letters I get to see the outline of the button, which obscures the text of the menu’s).

The test can be seen here: Homepage HFI, Meubels & meer

Hope someone knows what’s happening here, and can point me to a solution.

Probably best if you send us the project file and we take a look.

Just sent the file by email.