The Terra Shatterer is constantly reequiping when active, thus making it so that the active effect doesn't take place.

The shatterer in the gif is a Rank B and should mine a 3x3 area when active.

Likely to do with the same thing vaz mentioned on twitter the other day when the NBT is being updated. (see screen below)

Instance:
minecraft-1.8.9
forge-11.15.0.1699

Mods:
Baubles-1.8.9-1.1.3.0
Botania.r1.8-248-MC1.8-2c15b61
jei_1.8.9-2.18.1.88