Hey André,
Thank you for reaching out and sorry to hear about the issue. Unfortunately, theme conflicts extend beyond what we’re able to cover here on the support forms (see What support is provided for license holders?)
If you haven’t already, I recommend reaching out to your theme author to see if they have any insight on the matter. This trick has saved me countless times: simply right-click your mouse and open ‘Inspect’ to see if any errors display in your console. From there, it should give you a clear indication on what is causing the troubles and hopefully, with enough experience/research, you can solve the problem in a timely manner.
If things get above your skill set, we have a list of customizers that can help assist. Sorry we can’t do much here and have a great weekend. Cheers!