IPS Signatures - Out-of-date / Not Available

Using SEPM 12.1.4104.4130

We just started updating 5000 clients to the latest version (12.1.4112.4156) a few days ago. Now on the SEPM it is showing over 2200 clients Out-of-Date. When I click on Out-of-date from the Home screen, the report is showing IPS Signatures as Out-of-date / Not availble.  Any ideas?

Thanks,
Anthony