Macbook pro m2 connected to Ethernet cable disables internet to everyone in household

When i connect my macbook pro m2 to the Ethernet cable (via an adapter with ethernet port), my internet slows down drastically on the mac, to the point it becomes unusable. For example, it takes about a minute to load google.com on the browser, as opposed to it being instantaneous over WiFi.

Also, pretty much as soon the Ethernet cable is connected to the mac, everyone in the house loses their connection to the internet, so it's obviously related to the ethernet connection on the mac. As soon as i unplug the cable, everything goes back to normal.

I've tried restarting the mac, deleting the cable connection in the Network settings and re-connecting to it again, tried different ethernet ports on the router, but none of those things solved the issue.

On other devices (Windows PC and Windows laptop), the internet speeds are much higher when connected via Ethernet as opposed to WiFi (as they should be), and none of the connectivity issues are present, so it's definitely something to do with the macbook.