Ookla says 2.30Mbps / Xfinity says 1314.12Mbps?

I went away for 2 weeks on vacation. When I returned, I turned my PC back on and noticed it was slow to load websites. I updated the system, restarted both the PC and cable modem, and disabled my VPN. Still had the same issues. Checked Ookla and it was 2.3Mbps - Youtube won't even load, Gmail is taking forever to load images, etc. I checked my Xfinity app, and it says there are no outages, and that it is able to connect to my modem at 1312Mbps.

When I tried to get further help, Xfinity just says "It's your system".

I have checked other devices - my phone on the wifi gets 94Mbps. My tv upstairs (wired connection to the modem) was able to play video streaming with minor stuttering.

System:

Windows 11 Pro 64-bit (Build 22631)

Intel i7-9700K @ 3.6GHz

32,768MB RAM

GeForce RTX 2080 Super

Any thoughts on what I might be able to check?

https://imgur.com/a/vm84cQG

https://imgur.com/a/i7k437B