Cookie exceptions spontaneously change.

On the Privacy tab in Options the check box for Accept cookies from sites is unchecked. I pressed the Exceptions button and added many websites to accept cookies from and clicked Allow for Session on each one. Sometimes I go to a website where I have to sign in with a username and password and the site states that my browser is refusing to accept cookies even though I had added the site to the exception list. When I check the exception list, the status of the exception has changed from Allow for Session to Blocked. I have found several exceptions change on their own from allow to blocked and some even have changed again after I changed them back. What could be causing the exceptions to change and is there some way to make the settings persistent?

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