This support ticket is created vor 4 Jahre, 1 Monat. There's a good chance that you are reading advice that it now obsolete.
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I've performed some tests with a similar WordPress Archive on my test website and couldn't reproduce this issue. This suggests it is something specific to your website.
1. On your website, WordPress and a number of plugins including the Toolset ones, are not up-to-date. Please update WordPress, active theme and all plugins to their latest versions and then check the load more button again.
2. I also noticed some script errors and warnings in the browser's console when that load more button is clicked. They originate from the code at line numbers 59 and 66, in the script file from the child theme's directory. hidden link
In case the issue still persists, try removing these script lines and then check the load more button.
I hope this helps and please let me know how it goes.