Hard to say...I don't trade UGAZ / DGAZ that often anymore...Maybe some one else here can answer that question...I know that manipulation does goes on in most markets...
U currently tracking Mar contract. Yesterday's close 2.985. Today's close 2.939 Difference .046 Divided by yesterdays close is .01541 Multiplied by 3 (geared ratio for UGAZ)=.04623 or 4.6% decrease in value. I don't know why it shows 4.91% decrease on my ticker but it is in the ballpark.