I crafted a 144,000 mB Tank so I didn't have to keeping going back to my house to store blood but when I put it down and broke it, the tank became a 16,000 mB tank.

Also just a side thing that might actually be connected every time I brake the tank I lose the blood. I am not sure if that is by design but may explain, because that would mean that the drop is the wrong item.

Is this the case when you use silktouch?

Updating the mod appears to have solved this issue. I've broken several tanks and have no wrong items breaking.