autoprotect.sh and cron

I have installed centminmod on 2 vps. I noticed every night 2 emails from both servers, one at 00:11 UTC and one at 23:11 UTC with results of autoprotect.sh.

When I checked cron, I found:

Code (Text):

[root@vps /]# crontab -l
11 */23 * * * /usr/local/src/centminmod/tools/autoprotect.sh 2>/dev/null

This means, (every day at 00:11UTC -and every 23hours after that-) run this script.
Why do you use */23 for the hours and not at a fixed time ?
Is this a typo or intended ?

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What is the best place to change this ?
Probably if I change this with crontab -e, it will change again with an update of centmin ?
(I could not find the file where the cronjob is setup)