Right after the forest, there was a level with spikes. a little further on the right there was a waterfall, I thought it might have something hidden behind it so went through it and fell off the map. I learned that is is always good practice to put a respawn collision under the whole level because people had the same issues in our game. for the forest for me it helped modelling the foliage instead of using textures that might be something to look into but I am no expert either.