Kodi auto-update from Nexus to Omega, but how?



Hi Folks,

Need your advice here.
I am running Kodi Nexus for quite a while and sometimes  I have been seeing “running installation for the first time” which I didn’t do an installation during those times.
But last night, the message appeared, and only this morning I noticed it is now running on Omega version.

Is there a setting that could have triggered this?
I was only able to check add-on updates settings that I already put in the past for notify, but don’t install updates.
I can’t seem to find and update setting for Kodi itself.

I also checked on Android setting and didn’t seem to find one.

btw, I am currently running Android 7.1 on Mygica ATV 1900 PRO TV box.

Thanks in advance.