Problem with lepton invariant mass cut

Hello,

I generated a process
p p > w+ w- > e+ e- vl vl~
using Madgraph 5.2.1.0. I use the default run_card.dat except I changed these two lines:
115 = mmll
125 = mmllmax.
However, the invariant mass distribution of the two electrons in the event sample is not constrained between the two cut values. In fact it varies between 0 to 125 with a peak around 50 GeV. When I did the same process with MadGraph5.1.5.13, I get the correct invariant mass distribution. Is there anything mistake that I made here?

Thanks,
Reinard