High Ping on UEFN Map after release

So I just released a new UEFN Map. I have the issue that whenever I join and my game starts I have constant 300-500 Ping. I have no idea why it is happening. This also happens in the private releases but it has never happened while building the map and being in the sessions. Also the problem is not in my end because I asked a few friends to join the map and the same thing happens to them as well. Has this happened to anybody else and if so, did you manage to solve it? Or is this just a thing that fixes itself over time? I would appreciate any form of help! If you want to see for yourself what the ping problem looks like here is the map code: 0372-6228-0767