Attempting to log into my Realm gives me an outdated server error message

When i attempted to log into my family's Realm, I expected to go into my family's realm just fine.

However, when I tried to log onto the ream, it gave me a message that said "Outdated server - I'm on 1.12", as if I was on a more updated version. I am not running any mods on my computer.

Unfortunately, i cannot give steps to reproduce this bug, as i do not know what has caused it.