Players cant connect to my server after version update

I'm running a 1.14.4 paper server that I just updated to 1.18.2. NOTHING else has changed apart from this update, however players can no longer connect to the server from outside the network.

Important things to note:
  • The server works perfectly fine connecting via localhost
  • When I switch back to the old 1.14 version, players can connect
  • Port checking sites say the port is open when using the 1.14 version and closed when using the 1.18 version
  • Console confirms the server is being hosted on the correct port
I have no clue what could be causing this, any help is appreciated.
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