It threw some error while saving because of incompatibility with PHP 8. The developer asked the system admin to change the PHP version to 7.4, then it worked fine. However, we still receive the same error as warning while saving the post types in Toolset. This could be a problem in the future. We need to get an idea of how to fix this issue.
Can you please advise us if you need admin access? we are unable to provide you with FTP access.