Iron and Coal... Everywhere!

[rainbowroach]

So, I have a mine that is trying to kill me. Blocks that were once cobblestone becomes iron and coal, and then when you try to mine it,nothing comes out and it reappears a few seconds later. New random patches of iron and coal appear everywhere and I almost got smashed by them a couple of times.
It's the most bizarre problem I've ever seen. Fix please?

[Sir Prize]

The anti-xray plugin causes everything that's blocked on all sides to become smooth stone, until it is uncovered. The reappearing things are just lag.

[bowser956]

Yeah. HI COR.

[rainbowroach]

Ah, okay. I thought it wa just lag but it was the strangest lagging I've ever seen so I wasn't sure. xD

Hi thor.