block changeing from normal stone to silver fish stone

Put the summary of the bug you're having here

What I expected to happen was...:
I expected nothing to happen

What actually happened was...:
me and my friends built a arena of (chiseld stone brick,cobble,stonebrick)and we where fighting silverfish
and the whole arena became silverfish

Steps to Reproduce:
1. put down regular (stone,stone brick,chiesled stone brick,cobble)
2. spawn a silver fish
3. hit silver fish and the regular stone will become stone monster egg