is this "normal" if not what to do about it?

my experimental zone (the family site) klam.ca has a KSK and a ZSK. There appear to be time differences between the records reported by DIG and the source records on file. In the case of the ZSK the inactive date-time is a few hours different, but in the ZSKs case it is 3 months.

Is this a problem, and if so what do I do about it.

The following dates were found in the source record and the output from dig.

source record dig KSK -A 20150126163534 20150117012252 KSK -I 20150225173534 20150225144654

ZSK -A 20150126163534 20150126173534 ZSK -I 20150527015028 20150225173534