Mobile Menu appears twice (Icons for Cross and Hamburger)

My settings: Joomla v3.10.2, PHP v7.4.9, Template created with Template Creator v5.0.5, Mobile Menu Pro v1.4.0

I can't figure out why Mobile Menu Pro is not applying settings correctly.

The problem:
Menu Text: "Menu" remains, although set to "None".
The cross icon and the hamburger icon appear twice.

Please see attached screenshots.

What do I wrong?

Hi
Please give me the url of the page so that I can check the problem
CEd

Unfortunately, this is not possible. Internal network. No access from outside allowed.

Any idea what I could check?

please check that you have only 1 mobile menu enabled, and no hamuberger icon on the parent item
you must also only enable the mobile menu at one place (template or module), but not in both

I checked this. I didn`t activate it twice (in template only).

So I uninstall this extension and reinstall it.
Then I tested it with the "demo" style first - everything was ok.
But when I changed the "demo" style and use the builtin function to copy the style with a new name I have this issue.

I created an own style without using the "demo" style and it works now.

Thank you for your quick feedback.
Please close this ticket.