Safari logs me out of forums
I regularly visit several online forums for Logic Pro X, using Safari 13.1.1 in MacOS 10.14.6
For a while now, if I return to a forum after having been logged in a day earlier, I find that I'm logged out and I have to go through the login steps - pretty much every day. It used to be that I stayed logged in indefinitely.
I tried using Firefox and it keeps me logged in without limitations on all the same websites. Clearly, Safari is doing something to log me out each time.
I have looked through all the Safari preferences and can't identify anything that could cause this.
I'd appreciate any advice in this regard - it's VERY irritating. (I do NOT want to install a higher MacOS for various reasons.)