Worlds Not Saving and Game Not Closing Properly in Custom Modpack

[Mulixman33]

Im currently having issues with my modpack involving my single-player created worlds not saving properly when I exit the pack and my game freezing when I click "Quit to Title Screen" from within a world. It forces me to stop the entire launcher, which I believe causes the world map to be corrupt. I read my console and see nothing out of the ordinary, and the only real suspected mods wpuld be Somnia or EnviroMine, but I cant make heads or tails of the issue. 

Modpack Link: http://technicpack.net/modpack/minecraft-survivalist.39381