0. ALWAYS PROVIDE INFORMATION ABOUT MODLOADER (Fabric / Forge) AND MOD VERSION (For Example 1.19.2-8.2.10)

1. Describe the bug
   for a sec all the item in my back packs would dupe out of nowhere so i uninstalled the mods and reinstalled when i reinstalled now i am randomly getting items disappearing in the back pack

2. Write steps to reproduce the bug
   Put stuff in my backpack close out open again and random stuff goes puff

3. What is expected behaviour

4. Screenshots (If applicable)

Travelers backpack 1.12.5+24
Forge

I haven't released any version that's named 1.12.5+24