I'm at a total loss. The last three batches I've brewed have been 10 or more gravity points below my anticipated gravity. I don't understand it. Literally nothing has changed with my system or process. I have a 10 gallon cooler for a mash tun. I did notice that my thermometer was about five degrees off before I brewed today so I re calibrated it, assuming this would fix the problem but I still came in really low. Anyone have any ideas as to why this could be happening? Thanks in advance!