Proactive Threat Protection out of date

I have recently updated my systems SEPM to version 12.1.5 (from 12.1.4) and am working on updateing all the clients. Our clients are about a 50/50 mix of 12.1.4 and 11.0.5. I have noticed that all of the 11 clients have a Proactive Threat Protection definition date of October 22, 2014 whereas the 12.1.4 and 12.1.5 clients have a much older date of October 3, 2014. Do the two version have different definitions or is there an issue with my SEPM? Running LiveUpdate on a new client results in no change to the PTP definition but will update the other definitions.