Ok this happened to me before as well. Today I was logblocking something and I was in gmc and I hardly touched my boots and they just turn to regular diamond boots. The previous boots I had was Platinum Boots which I added AntiGravity V on and the one today I lost was a Valentine boots gkit one (cupid) which I also added AntiGravity V on. I hardly touched my boots and it just immediately turns into plain diamond boots. I'm not sure how it just does it but I think something should be fixed.