I am working on a J 3.10 site that have been migrated to J4 with the Blank BS 5 template installed.
When I try to save template settings they sometimes reset the original settings. Sometimes when I clone the site setting/layout/themes I can manage to save setting, but if I edit them, the changes are not saved.
Sometimes when I delete something - say a palette - and it re-appears!
I have a fresh Joomla 4 site to compare and I do not have the same issues with that. Everything works fine.
So it can't be the cache control settings in the Response Headers as that would affect both sites.
I have checked htaccess and I can't find anything that could cause this issue.
When I look at the JSON files that store the custom settings I can see my changes are there: say I set the H1 font size to 36px. But on the template setting it shows at 46px and when I change it and save, again it shows as 46px.
I would appreciate it if you could just have a quick look and find out what is happening.