Is it possible to check that the HTML CSS Errors of the generated Tags from the sitebuilder.
Please try to correct the main issues.
We could see that the style tag names can be configured for each content block also in the sitebuilder.
This would mean that it should also be possible to eliminate the doublicate ID errors
https://validator.w3.org/nu/?doc=https://www.jmc-software.ch
Thanks