[rancid] Cisco flash changes observed after 1st time install

[c4632 at comcast.net]

New user here, no luck via Google, hoping someone here has seen this behavior. 

Rancid 3.1 on CentOS 6.7 

I got my first Rancid instance up and noticed the following in the diff: 

- !Flash: 294 4096 Jan 29 2016 03:02:19 LOCAL-CA-SERVER 
+ !Flash: 294 4096 Jan 29 2016 09:01:46 LOCAL-CA-SERVER 
- !Flash: 3868 282 Jan 29 2016 03:02:19 LOCAL-CA-SERVER/LOCAL-CA-SERVER.crl 
+ !Flash: 3870 282 Jan 29 2016 09:01:46 LOCAL-CA-SERVER/LOCAL-CA-SERVER.crl 

This happened a few times through the night, the only thing changing is the timestamp. 

I'm hoping someone here can advise if either: 
a) this is normal and there is a way to suppress this from triggering a diff report, or 
b) I should be concerned and rancid is telling me so. 

MTIA! 

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