Bug? Backups don't listen to cron

[ja3]

I have added the following cron in my reseller panel for user backups:
Minute: 13
Hour: 5
Day of Month: *
Month: *
Day of Week: *

Now my problem is that DirectAdmin only backups on the 23/25/27 etc. On the 24/26/28 day it doesn't backup, but why?

Thanks,
ja3