Blacklist disappeared in SpamAssassin?

Hi, I've only been using cpanel for about 5 days now. I started a blacklist in spamassassin during the weekday at the office using desktop pc. At the weekend I logged in at home using my home laptop and added a few more entries to the blacklist and saved as per usual. I just got in the office Monday morning, logged in to cpanel and the blacklist entries are gone. Ok, I can restart the blacklist again but I prefer to know why it dissappeared in the first place. Thanks for any inputs.