Airport router suddenly changes WAN to private ip address?

I was just watching some videos on the internet then the internet stopped. Laptop said it wasn't connected to the internet. I go on my iphone to see what's up on the airport app, and it says my WAN ip is a private ip. Sure enough i check and it's magically changed to 192.168.100.10.

used to start with 168. I know a bitmire than most people when it comes to routing but i'm no genius.
Have i been hacked and they tried changing the ip or something? It suggests i switch from DHCP&NAT mode, to Bridge mode. I don't really think that'll fix the problem though cuz it's still an invalid WAN isn't it?

Scary.

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