Items Disappeared ?

I recently purchased 2 ancient keys ($5) and used them in Skyblock. I got an Ancient Sword and a Premium Hoe. After a couple of hours of playing, I got my hoe to level 6 and round 10k crops harvested and I upgraded my sword so it had Sharp 6, Fire Aspect 1, Unbreaking 3. I had a couple of other less important things in my inventory (diamond pickaxe, chicken, cactus, cobble, etc) that I don't really care about. I'm annoyed because I basically paid for those items irl and now they're just gone. They weren't lost to clear lag or stolen by someone else or anything because they were in my inventory.

Any help is appreciated, this is very frustrating.

Thanks.

 

It was just a few minutes ago. Between 3:50pm and 4:10pm EST on July 7.