Were you one dot from knight or one dot from seeker or follower? Not sure how long you been working the virtues but there are 3 levels -Followers, Seekers, and Knight. The dots do go back to 0 for each level. Did you use the virtue? Using it takes away dots also. They also decay a little over time - had it been a while since you worked them? Sorry if you know all this but just trying to see because I have not heard of any bugs like that and I checked my virtues and all are where they should be.