Cumalitive update Mismatch - failing to install

HI all,

Been scratching my head on this one for a while. I have a 5 server farm - 2 web front ends a SQL server and 2 application servers.

Checking Manage Patch Status on the farm central admin says I am missing some patches on one of the servers. If i follow the link through on the missing patch i get a message upon install saying there are no products affected by this package installed on the system.

If i try and install the latest CU - I get the same message, i have followed other articles where i use get-spproduct, do an iis reset or restart server and I still have an issue.

Any Ideas on where to start?