LDMS 9.5 computers disappearing from console

Good Afternoon,

My configuration is I had LDMS 9.0 installed SP3, then I performed an in place upgrade to LDMS 9.5 using a SQL2005 Enterprise Database

I have about 1000 nodes on Landesk.

I have just noticed that there are a few nodes that do not show up in Landesk Console

I went to one of the computers and performed an inventory scan figuring that would fix it, it still did not show up, then I ran a security and compliance scan from the computer, the security scan failed with no code.

Any ideas??