Quote from ThaokyRaid info is gathered at login and when entering/leaving an instance, it should normally not be impacted by other addons. This info may help you narrow down the problem and find a explanation.
If i open altoholic or zone raid info is kept jsut as expected. However having a character with raid info saved in altoholic logging in and then out without zoning or opening altoholic wipes the raid information for that character.
Are you sure raid info gathering at login is working properly?