Disappearing Heads?

Hi! My IG is Pingzza99 and I usually play on creative server 1. I hadn't been on my plot for a couple of months, and since its summer break I decided to come back. I was trying to put down some heads for my head shop, but when I did, the heads didn't place and they disappeared from my inventory. I tried this with multiple different heads, but to no avail. I asked a VIP, DaAsianLama, to see if she had the same problem. When she didn't I asked her to teleport to my plot. I gave her permission to edit my shop, and she put down my heads with no problem. The heads she put down I was later able to put down also. Weird thing is when I tried setting a new head down, an emerald ore one, it disappeared on me. I gave her that same emerald ore head and she put it down just fine.

I disposed my plot, and claimed it again but unfortunately I continued to have the same problem. Is this a bug/glitch? Anyone else having this problem? If someone could inform me more on this type of glitch that'd be great!

 

All-U-Want dont work.

 

What do you mean by All-U-Want?

 

All-U-Want is a mod for Minecraft. You're able to make overpowered stuff with it.
I don't know about this bug since I never play Creative anymore. I was able (Was because my computer crashed.) to place heads in Skyblock and Creative. Maybe staff knows how to help you.