This is an old issue that I already saw several old posts for with no resolution as far as I could find.
All my mods in the launcher keep resetting to inactive after exiting the game. I have to go back and reorder them and reactivate each of them every time I want to play. Everything worked fine until I DLed some new mods. I recently installed the new map mods after getting tired of seeing the same map over and over. The Swamp maps mod does not work BTW, it crashes the launcher if activated. This started after this round of Mod installs.
I am running vanilla version 1.65W