Chris's observation is the correct one. If the springs are upside down, they will be too far forward and will exert less pressure on the sear.

I know most of the conversation has focussed on the sear springs, but doesn't it look like the sear engagement on the left hammer is "squared" off more than it should be? This would reduce the trigger pressure required to trip the sear. Might be just the lighting, but it looks that way to me.