Password security 15mins settings issue

Recently upgraded from NIS 18.x to 19.x. I have chosen the 15mins automatic logout in passsword security settings, Every first time i boot machine and login to my profile, after i login to IDSafe and i keep using the machine  for 30mins or 1 hr or more and the machine never goes to idle state but IDSafe logs out and asks me for Validate password. later i validate i didnot see this issue occuring again for the whole session (i believe).

 

I've seen this consistently several times in this past 2 weeks.

 

Appreciate your help and thoughts.