I had a diamond pickaxe fortune 3 and unbreaking 3. I was getting ready to go for a bike ride and left my game on. When I came back, I simply typed /kit starter and my diamond pickaxe was gone. I don't know what happened, and I don't know why. If someone could please help it would be greatly appreciated.

 

Yes, but that may have not been it seeing as though I didn't check my inventory when I returned from being afk. It's something that I will never understand, but, I don't really know what happened to it.