I have already tried many possibilities, but I can’t set up to align these button centered again.
Especially because it is displayed correctly in the block view.
What is the problem?
in your Element, duplicate the parent container block, so you now have 2 x the content, and then delete the original one. This should regenerate the unique classes and eliminate any CSS conflicts
Just so you know, its kind of a bug.
If you copy and paste to the same post, then ALL is ok.
If you copy and paste to a different post including GP Elements, then the unique classes don’t get updated which leads to a CSS conflict.
Until we find a way around that ( or WP does ) i Duplicate the Cut and Paste blocks to other posts.