I have a Netgear router that I use in router mode. For some odd reason I logged on admin page and found it to be operating in Access Point mode. Is this bug/error is normal behaviour by routers or have been someone tinkering with my router? Only I have the pass for the admin page. I did a factory reset and changed the password
Not normal behavior. It's possible the router had a firmware update that you may not have been aware of but that's unlikely. Might be time to consider buying another router if that one is getting along in years.
This one is only 2years old, it functions as advertised, and I did update the firmware but I also reset it and set it up all again. I noticed this first when I tried 192.168.1.1 and the admin page wouldn't load up.