Hello. Thank you for contacting the Toolset support.
Well - I would like to know that do you want to assign the static parent or you really need parent select2? Are you using any bootstrap modal or is that possible for you to share the link where I can see the problem?
Well - could you please share wp-admin access details with full permissions so that I can see how things added to that page from backend and what CSS it needs to fix it.
*** 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 would additionally need your permission to de- and re-activate Plugins and the Theme, and to change configurations on the site. This is also a reason the backup is really important. If you agree to this, please use the form fields I have enabled below to provide temporary access details (wp-admin and FTP).
I have set the next reply to private which means only you and I have access to it.