Extra machines appearing in collections in SCCM

[neonetman]

God monring all,

 

I've just taken over a school network, and whilst lookign at SCCM I seem to be getting some strange results:-

 

The collections I'm having issues with have a query based membership based on the OU the PCs are in... e.g. all PCs in an OU will be members of the relevant collection.

I have a number of collections showing more PC's than should be there (including a test collection I have just created)

 

For example, the collection for room 138 points to the OU for room 138. The OU contains 14 PCs, yet when I left last night it had 21 members in the collection, increasing to 23 this morning

 

I'm completely bemused where these extra PC's are being picked up from.

[neonetman]

Just a follow up on this.. still no further forward..

 

I've rebooted the server, and updated the membership on each collection (starting with all systems and working down each limiting collection ).. still no joy.

 

Has anyone come across this?