I have several users questioning about the Enterprise Activation data status. (I am one of them too

)
When I checked my device (Options | Advanced | Enterprise Activation) last week the status said I got activated on Jan 27,2009. Then this morning, when I checked the device status, it said I got activated on Feb 17.2009.
I am the only BES Admin and so no one has the password to login to the server. I certainly didn't activate my device. (Last night I did the activation on my device is back in Oct 2008)
In that case, what causes the status changing the date?
Thanks