Incredibly weird problem with USB-C dongle

[Vanion]

Hi

So... Recently I changed my PC setup to a thunderbolt setup with my laptop. I use two dongles. One with two DP 1.4 and one with USB, Ethernet, power passthrough and sd card slots. After setting it up everything worked fine up until I disconnected my laptop from the dongle with the ethernet port. After I did that my network stopped working (WIFI and LAN, my Routers LAN ports weren't working anymode so it didn't have a connection to the modem anymore). I found out that this was caused by unplugging the laptop from the dongle but leaving it plugged in to the power outlet. I've tried multiple dongles of the same type and the problem kept happening. If I plug the ethernet cable directly into my modem it works fine and the modem continues working after I unplug my laptop.

My current theory as to why it happens:
I believe the dongle receives too much power and transfers it over PoE to the router which my specific router can't handle and it just sits around doing nothing.

 

My router:

Netgear R6800

 

My USB dongle:

Satechi USB-C Aluminium Multiport Adapter

 

Does anyone have an idea how I could try to fix it?

In addition to not knowing how to fix it I have absolutely no idea what keywords to search on google for my problem...