Yes, if i disable my custom css the anchor works fines roll up too.
it seems to be the css blocking the page sub-titles under the menu ( .title-fix) You can see it in the inspector.
I solved it like this:
1. I have not removed my custom css.
2. I removed the anchor from the sub-titles and added it instead in a space block ‘above’ the sub-titles.

Now everything is working correctly!!
Thanks anyway.
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Keep it up, Generatepress is awesome.
I hope you implement Full Site Editing soon