I'm using the most recent claymore. Pretty sure it's just an error at this point. No hardware problems. Running for 24 hours shows reported of 314mh/s (5 R9s all over 50mh) and two RX480s each at 20 something. Pool reports closer to 140mh/s.
Only showed in console. Look at pool hashrate. My old R9 380 shows 150mh at the moment in claymore, but on poolside it is 23mh. So it is only a visiual bug not more.