I entered Rapidgator member in preferred sites but is always deleted

Hi, im a Premium user of Rapidgator.net. Cookie it always asks me to enter the login credentials even though it is one of my favourites, it is the only domain that does not keep the data. How can I avoid this?

@SweetP
Thanks I've all removed, close and reopen Cookie without results.

Hi, here Cookie 6.7.2 on Mac Studio Max. This release ask to allow access to WebKit folder every close Safari. Any help for this? Thanks