NIS indicates wrong remaining days

On Nov 12, 2013 I installed NIS in two of my three computers. NIS will be installed on my third computer after 7 days when my previous NIS installation expires after 7 days

 

Everything was fine untill today (Nov 28, 2013)  where in one of my computers the NIS tells me that I have only 7 days remaining.  In my other computer it shows the correct remaining days.

 

I would like to point out that in this computer I also had another NIS which I uninstalled on Nov. 12, 2013 and that would expire in 7 days.

 

How can I correct this problem? Any ideas?

 

Thank you

 

Paul