I noticed that I don't have that problem with other ports, only 25565 - weird. Can someone help anyway - does someone have a clue?
Isn't me trying to help you out good enough?
To be clear, the issue isn't with the pack it self, the issue is with something on your machine/OS - or the use of it.
The 2 things I pointed out (cc cleaner and the AV software) - did you sort that out, or did you just feel that my suggestions wasn't good enough and didn't bother?
Some possibilites and well educated guessing about not having issues with other ports:
perhaps you're not starting/stopping other processes / applications / services as you do with Minecraft - and therefore not noticing
perhaps other applications are applications that the AV software is aware of, and therefore not blocking
If sorting out AV doesn't help - and we hope that CC cleaner didn't break your system already:
Do a:
Get-Process
in powershell - this will list all running processes, look through that and try to figure out what could be blocking/breaking stuff
If you need further help with the matter, perhaps contact the hoster if they offer the support - or contact Microsoft for further help.