I have recently upgraded my NPM to unlimited, although not sure if this has any bearing on this! I have noticed that the "Top 20 Subnets by % Address used isn't updating".
All the services are running, so cannot figure out why nothing is changing...and it should be.
I have also noticed that for subnets with 23 CIDR, the full range isn't being reported on, i.e. it tells me it's 82.23% in use, with 91 IP's Available and 138 Used!! This doesn't even equate to a /24!
I am running IPAM v2.0
you should contact Solarwinds support in this case.