C:\ Utilization Filter Not Working

I have a report that lists C:\ drive capacity, usage, remaining and percent-used for VMs. It is supposed to filter for VMs with 90%+ utilized C:\ drives.

Since upgrading from 6.7 to 7.0, the filter is no longer functional.

Without the filter, C:\ percent-used displays correctly.

But with the filter, VMs that do not have 90% C:\ utilization are displayed (including VMs with no information at all).

This is problematic as the purpose of the report is to display only VMs that have 90%+ utilized C:\ drives.