Hi Theme Horse Support Team,
Just a note to thank you for solving this issue for me.
For anyone else with this issue, I’d like to quote what you did:
We have updated some of the settings/options by deactivating all the plugins one by one
and found that this is not the issue of our theme.
We found the issue with one of the plugins named 'Remixer Gutenberg Blocks'.
For now we have deactivated this plugin and all options work fine.
If you do not need this plugin you can delete it or contact the main author of the plugin to solve these issues.
Also we have tried activating another theme and found the same issue while activating the 'Remixer Gutenberg Blocks' plugin.
Again, thanks for your support.
NF