I get this now with my MN:
Warning: Your masternode version (120100) is behind the official version (120102). This is from DASHcentral.
I am running 12.1 so do I need to upgrade again. I just updated last week...??
and go through the update procedure and reset my time and loose rewards etc.
I get them a lot too, but eventually Dashcentral gets things right and reports my node properly. Just leave it alone, seems to be the best advice I have received and tested.