Internal clock running too fast

[Alessandro FAGLIA]

I have a brand new PE850, where cron runs a daily job which synchronize 
the local time with an NTP server.

Every day I get something like this:

6 Sep 05:00:14 ntpdate[10174]: step time server 193.204.114.105 offset 12.781591 sec

12 seconds every day! Other servers usually show a time difference of 
about a couple of seconds, no more.

Is this shifting normal (i.e. other users have the same "problem"), or 
should I be worried about?


Regards.
Alessandro