all server disk usage reports not working correctly

Recently the all servers disk usage report has not been showing data from all the servers listed.

There are three servers not listed. however, when I click on the servers not in the report through my server view, the disk utilization graphs do show up.

If I click on the All Servers availability report, all the servers show up as well.
All of the default server reports show information from all my servers, with the exception of any disk reports. I've removed and readded the disk space monitors on each server thats not showing up and I waited a couple days for data to gather, I also ran a rediscover on the devices, but they still do not show up in the disk usage reports.