Canasta score total errors or players cheating

It has happen to me twice in the past few days while playing canasta.  I had a very big lead over my opponent and when the hand ends the score total is different and I lose about 1000 points.  I dont know if it is a pogo glitch or players cheating but I wish pogo would do something about it. And no I am not mistaken I always keep up with the score total