Dell SA shows incorrect value for "Drive Space Available"

Periodically I get a popup message from SupportAssist with a status summary.  It shows that I have 1.02 GB drive space available.  In reality the free space is 813 GB (255 on C: and 588 on D:).  This also appears if I manually run SA as a 90-day summary.  It also seems that the 1.02 GB value never changes, even though the used space on my system certainly has.

Is this a bug in SA?  It's certainly misleading.  If the 1.02 GB refers to something other than my actual available hard drive space, it should provide that information.