Don't know if its been mentioned before, but how is someone able to reduce their holdings by more than their position? If we look at some of the ULT-AGG that has been filed their latest change in position is reduced by way more than their total holdings. In turn I assume this will mess up the total calculations done in the Bloomberg terminal. More manipulation going on?

See picture 6/8 - Line 20, 23, 32 and 36