If you've, in fact made these changes as you've said, there should be evidence of this in /var/log/messages.
Likewise, if someone is changing it back, there should be evidence there as well.
Also, when you issue the necessary configuration via clish, you should see it reflected in /etc/syslog.conf.
If you don't, then do an lsattr /etc/syslog.conf and see if the "i" flag is shown (immutable).
If it is, then any change you make in Gaia won't be reflected.
Then you can run chattr -i /etc/syslog.conf to remove it.