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Safari saves my password, but usually I stay logged in. I had logged out once or twice but was able to use the password in keypass to login (to avoid that hassle, I tick "remain logged in"). The mess happened when I was prompted to enter the active key for a transaction while in posting mode. Then I was logged out of everything like a fuse blew.

One thing you might want to check is to view which password Safari has saved, and see if it matches a key or password that you expect. Another thing I would try is to just try logging in with every other password from your KeePass. It's easy to accidentally copy the wrong password when you're using KeePass sometimes.