Linux Server Doesn't Work Correctly.

I run a server on my small server computer at home. Its currently running on Ubuntu 22.04 LTS.

The problem is the following; when I join from inside my home network everything runs smoothly, but when my friends or me disconnected from my home network tries to join, it connects, but everything in the game lags and freezes and then the client gets timed out.

Specs:
-CPU: G4560 (note: I have tried using a 9400f as well)
  • Motherboard: AsRock H110M-HDV
    -RAM: 32 gb 3200 MHz
  • Storage: Brand new 2TB hdd
  • Internet: Ethernet (100 mbit download and 20 mbit upload)
Solutuions I've already tried:
  • Switching motherboard and CPU
  • Both Debian 12 and Ubuntu 22.04 LTS
  • Port Forwarding works
  • Hosting on my PC that is connected to the same router as the server, which worked.
  • Running both Vanilla, Spigot and Paper
  • Running it in a Docker container
I'd be grateful if anyone could DM me so I could show my setup through SSH. Or any help/tips would also be appriciated <3

Ask if there is any system information/config files u need!
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