Connection Very Slow on Home WIFI

Hi, I'm using a wireguard vpn I setup using this github repo on a server I have on racknerd.
https://github.com/angristan/wireguard-install

I've had no issues using vpns before from the same server but for whatever reason for the last 2 days I've noticed that if I connect to it from my home internet the connection is pure garbage, but if I connect from my cell provider's network the vpn works solid.

Whats happening? how do I get this sorted, I'm lost and need to fix it.