Logrotate running too often?

I’ve been playing about a little with vsftpd on the WDMyCloud and everything is working really well, with the exception of my vsftpd.log files.

I’ve set my vsftpd log rotate file to be:

/var/log/vsftpd.log
{
size 10M
missingok
rotate 10
nocompress
daily
}

But when I look in /var/log/ I see that log files are not being created daily as I’d expect:

-rw------- 1 root root 140773 Jan 12 18:37 vsftpd.log
-rw------- 1 root root 205 Jan 12 01:38 vsftpd.log.1
-rw------- 1 root root 61896 Jan 12 16:50 vsftpd.log.2
-rw------- 1 root root 67 Jan 11 00:18 vsftpd.log.3
-rw------- 1 root root 493618 Jan 12 16:46 vsftpd.log.4
-rw------- 1 root root 2973 Jan 10 02:27 vsftpd.log.5
-rw------- 1 root root 595 Jan 9 23:46 vsftpd.log.6

I expect this is something really silly that I’ve overlooked but, not being particularly linux aware, I’ve hit a wall. Any one got any ideas?

Thanks,

There is no information available on WD’s Support site related to this. Hopefully an experienced User will be able to assist.