Skin doesn't work properly after converting from 2019 to 2020

Hello everyone, as you can see in the title, i have a problem with my skin. 

I just convertet a 2019 project to Robohelp 2020. As you can see in the pictures, now the skin isn't generated properly. In the first picture you can see the preview of the "Orange" skin(and how it should be) and in the second picture you can see a example of the generated project. As you can see on the left side, everything is a link and the index has a different format. 

I have multiple skins, and this issue only occured with one skin. I can just use another skin, but i maybe there is an easy fix.