Things I Pick Up Appear As Null Blocks

ok so. i threw an emerald out and when i pick it up this happens.
the emerald still returns to my inventory but the block covers half my screen each time i pick it up. Anyone know what is causing this? It just started happening randomly before i took a break from wynncraft.
Im using blc 3.0 (my fren is also using it so cant be that) and i just resetted my computer so there shldnt be anything affecting it. It may be my blc settings or some server issues pls help.

Edit: not happening in other servers only wynncraft. I might have switched version recently before this problem happened

 

try playing on 1.12.2 rather than 1.14.4