Left-handed shooter's trigger finger has to stretch towards muzzle and then to the far right to shoot the right barrel on conventional layout of double triggers. If the finger slips off, the left barrel's trigger is easier to hit with the finger because rear trigger is on left side of gun and more exposed because of offset to the left. All this can be compounded by sweaty trigger finger on a hot day and not reaching quite far enough with trigger finger.
Right-handed shooter less likely to do the same. Nothing against you left handers.
I am a left handed shooter and that explanation makes no sense to me at all......unless one has big fat fingers or child size fingers...........a "quarter of an inch" sideways has zero bearing on trigger pull for me -(I suspect most average male shooters as well)- and I am always wearing gloves..........the geometry just doesn't add up to support that explanation...........the trigger pull motion is fore and aft only, not left and right...and should be just a finger tip motion.............
On most double trigger guns, the front trigger curves left to the center line of the trigger plate and the rear trigger curves right to the center line of the trigger plate....so both trigger tips are centered and in line if installed properly.........................
I suppose some people will call that "far right" and "stretching"...........but I don't..............
Cheers,
