@2_Tron - As the Authenticator app is generated by Google, using their algorithm, this isn't an issue on Jagex's side, and also sounds like it just may have been a bit of a hiccup on Google's end. Seems like there shouldn't be anything to worry about!
Community Manager for Jagex
Although it looks like the OP has their answer, nobody has requested a lock yet, so there's no harm in leaving it open for now.
Had it been in another section of the forums it would probably be different, but we can leave that one for a short while in case there's any more useful advice.
Who's the cat that won't cop out when there's danger all about?