I think that might be due to the fact that if there is not enough data to determine the average Steem rate the fallback is used. The fallback is pulled from the Steem API using https://api.steemit.com
It is possible the server had issues at that time. Everything seems to be in working order right now.
Thanks man, but i think the problem is from network availability in my environment.
I still keep seeing this,
I wish someone can help me check it so i know what I'm earning.