My diamonds were eaten by the update

If you read this, please remember it is SKYBLOCK, and hard to get diamonds.

About two weeks ago, I logged on and I asked if I could buy diamonds from someone for a lo cost on your SKYBLOCK server. I bought 11 for $1055 each. I had not been on much between then and the update (I was banned half the time), so I didn't know of anything like this happening. When I got on the day after your server updated, I lost 11 diamonds, and 1 diamond chestplate (the chestplate and 2 diamonds were in the /enderchest I created). I beleive this to be a bug, because it could of happened to a big amount of others.