Auto Replace Current item with Populated Items

I used the plugin on many sites but on a new site I have a problem with the Replace Current item with Populated Items which is automatically checked. I have checked this option for a specific menu item and now after saving this option is checked automatically for every new menu item with JC submenu active.
I tried to remove JC submenu on all theses menu items and save but as I set JC submenu active again and save, The replace box is checked for all menu item where JC submenu is active.
This new site is on a PHP 8 server.
Could this be the problem ?