Ok. Based on the debug information you shared I can see you are using latest Toolset plugins.
In order to minimize the cause of the issue and ensure there is no conflict with theme/non-Toolset plugins you are using
*** Please make a FULL BACKUP of your database and website.***
Could you please try to resolve your issue by deactivating all third-party plugins as well as with the default theme to check for any possible conflicts with any of the plugins or themes?
- Do you see any difference?
In addition to that, do you see any error with your error log?
Can you please share admin access details and problem URL on what post type you experience the issue.
*** Please make a FULL BACKUP of your database and website.***
I would also eventually need to request temporary access (WP-Admin and FTP) to your site. Preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed.
I have set the next reply to private which means only you and I have access to it.
Thank you for your response.
After some considerations, I have decided not to pursue resolving this issue with Toolset and will try to find other means to add new post types due to urgency. In the meantime, I will continue to check if there are truly conflicting issues with existing plugins and/or themes with toolset.