Beaver6675,
Looks like during status poll or scheduled discovery, OME is losing connection to RAC device and that is probably putting RAC to Unknown group. Once the connection is restored, on the next discovery cycle, RAC is classified properly.
How often do you run status poll and discovery ?
Are there any n/w issues that could lead to connection loss to iDRAC ?
What iDRAC version and server model has this issue ?
Thanks,
Raj Shresta