It can have something to do with the use of incognito/private browsing.
Some sites may have strange or "mysterious" behavior due to the use of private browsing. In some cases, sites don't even function without the accepting of cookies.
Now if you're being called to type up your password twice due to it being incorrect at the login screen, then the password was probably incorrect. I get that sometimes due to typing it fast or accidentally leaving on CAPS LOCK.
Try to take your time the next time you login.
It never happened to me, and Dave you shouldn't log out, because it's dangerous.
And Mo, logging out is actually the safest thing to do. If you happen to share your PC with someone, and stay logged on, the person you share your PC with can gain access to your account and use it.
Logging off prevents that. It's dangerous in staying logged
ON if anything, not off.