The nitro Creepers are ignoring the codechickencore environmentallyFriendlyCreepers=true config value.
A normal creeper will not brake blocks with this value Being true. Nitro creepers will brake blocks if the is true.
info
1.7.10
FTB∞ evolved
1.7.10-92.8a1150f

1.7 is no longer being updated. Feel free to submit a PR.