Are you running some soft of vpn client setup?
Here is the thing out of the box rules on lan are any any... And pfsense will nat all from its lan to its wan IP.
So if your WAN network is 10.1.1.0/24 with pfsense wan IP being 10.1.1.1
And your lan network is 10.1.2/24 then all clients will look like they are 10.1.1.1 when they talk to your wan network, ie pfsense wan IP.
If I had to "GUESS" to your problem your forcing traffic out some vpn gateway on your lan rules - which we would know if you could post a simple screenshot vs making gifs with zero information in them.
Other guess would be you have the wrong mask on your clients and they think that 10.1.1 is the same network as 10.1.2 say example a /8 which is what windows would default mask too, etc. etc. So how about you post up a config of your clients.. Show a traceroute to say 10.1.1.1 and one to 8.8.8.8
And post up a picture of your lan rules - and validate your not using any sort of vpn, and or is your clients pointing to any sort of proxy or using their own vpn client.