Disclaimer before I describe my issue: I am using a brand new HP Pavilion (I've only had it one week), and I am playing singleplayer with mods. My mods are Optifine, Animania, Mo' Villages, Pam's Harvestcraft, Gravestones, Minecraft Comes Alive, Decocraft, and Mr. Crayfish's Furniture mod, all for 1.12.2.
Here's my issue:
Earlier this evening, I exited my save and left my game on the Main Menu, and when I came back an hour later and reopened my save I had some new items in my inventory that were not there when I saved and exited. This is not an issue of it not saving correctly, as all of the work that I had done just before I exited was still there. It's as if someone had played with my game while I was away from my computer, but this however is also not possible -- I live with just my parents, and they have no interest in Minecraft and wouldn't know how to find some of the surprise items that I found in my inventory. From what I can tell, the new items are six pieces of bread (which I know for sure I did not make, as bread is complicated in Harvestcraft and that's why I've been putting off making it), and ten pieces of coal. I also have an iron sword that had been just around 40% when I saved and exited, and is now back up to nearly 100%.
I'm not sure what to make of this. I've also been having an issue with the menu opening without me pressing the escape button, but I wasn't concerned about that until I had this other issue.
Basically I'd like to know if I should be concerned about this at all. Does this suggest that there's something wrong with my game? Or could these just be some bugs from the mods? I'm very confused.
If anyone has any thoughts, theories, or suggestions, they are very much appreciated.