I'm playing a modded version of MC 1.12.2. I only have Mo' Creatures, Tree Capitator, Optifine, Xaero's Minimap, Huds armor and damage indicators, and any other mods that are required to make those ones work installed.
I'm playing a single player world that I really love and have put a lot of time and effort into. Suddenly, every time I log off and reopen the world, neither my inventory nor my last location has saved. My location and inventory continuously revert to a save I made probably about 10 saves ago (I hope that makes sense). However, everything I have built, destroyed, or stored in chests remains the same (meaning if I mine an iron ore and log out, when I log back in, there is no ore in my inventory and my location is different, but the block has been destroyed). It's just my inventory and location that are consistently incorrect every time I enter my world.
I have tested this problem out some of my other worlds, and the problem only appears in the one that is giving me problems. My location and inventory save in 4 of the other worlds I have.
I would really appreciate all the help I can get on this! I want to get back to playing my favorite world