Rolling doubles when Advantage or Disadvantage is toggled on in 5e character sheet

Basically what the title says. I've noticed in both games I'm playing that whenever someone rolls with the advantage or disadvantage toggle on, they roll the same number twice at an unusually high rate. Obviously this is possible, but we've had situations where it has happened seven times in a row. Three of those were all natural 1's, one after the other.  Has anyone else experienced this, or am I just witnessing some insanely unusual luck? 

Barring a formula problem, you were likely just sitting at the end of a probability curve. The dice are exceedingly random, and if behavior like that were common, there would be many, many reports. Usually I see one or two a year where people will report some rolling anomaly, which is what you'd expect given the number of people rolling (millions) and the number of rolls per game (hundreds?)