My tactics training went from about 1400 down to 700.  All of a sudden I was missing tons of problems that were supposedly rated at 700-1000.  So my rating as of yesterday was about 800, then today it says that I have a rating of ~1400 again (Back to about where it should be)  And the previous problems I did are now rated in the range of 1300-1800 that were previously rated at 700-1000. 

Was there a bug that was fixed or is this just me or should my rating really be 800 or 1400?  Im really confused.

Yes, there was a bug see this thread in the forums

http://www.chess.com/forum/view/help-support/tactics-trainer2?page=2

hope this helps.

Hurray! My Tactics Trainer is back to normal! Stupid bug had everbody's messed up but it's fixed now and I can see were I really am on playing!!!!!! It is a happy day!