This is another unrelated issue you are experiencing from the sound of things, just a heads up. Generally speaking you should start another thread as to not clutter up another one with unrelated questions.
But here’s the answer to your problem: If you are getting kicked to the loading menu, then it sounds like you don’t have it set to force load your map under the world settings potentially. Set it to force load your custom .umap file and I believe that should resolve it.
If not please post a new thread with additional details so I can help troubleshoot it for you. I’m taking a swing in the dark at the culprit right now due to lack of info and background on the mod. The more info you provide, the better picture I get of the situation, and the more accurate my troubleshooting is as a result 
- Sinari