Overnight jumps are pretty common, but I just started looking at the Short/Long Russell2000 and noted that these ProShares instruments are prone to jump and then jump back very close to an offsetting gap size the next day. It's almost like someone took a near continuous price curve, chopped a day out, slid it up or down by $X and pasted it back in. Last Friday and Monday are good examples. (June 11 & 15). This is an interesting phenom ... can anyone explain what is driving this odd symmetry?