$ProShares Ultra Bloomberg Natural Gas (BOIL.US)$ I discover...

$ProShares Ultra Bloomberg Natural Gas(BOIL.US)$ I discovered a very strange phenomenon. Needless to say, the boil is getting lower time by time. At the first new low of BOIL, the highest price of Kold was 176, while BOIL recently reached a new low for the second time, the highest price of Kold was only 155. This wear is a bit severe. Did the bookmaker squint (can anyone tell me what that explains)