Items disappear in my and Wolfy's ec

My problem Today, I was searching for my turtle shell, that I farmed with a lot of pain, to apply Protection VI on it (*the book is in my ec if u want to check). I was sure that it was in my ec but not ! No turtle shell inside ! ==POOF== It disappear !! Nothing inside my ec.

Wolfy’s one Today too, my friend Wolfy lost 24 nautilus shells in the same way, I want to tamk about this too because it was 2 diamonds/1 nautilus shell, we spend 48 diamond sin that so if we can have them back it would be cool