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Of course, that's because I am used to: Shoot, pump, shoot, pump...... Unless you remember that it's Shoot, shoot, pump.....you drop half of your ammo on the ground
Minor correction: the action is locked until you've fired both shots. So you can't accidentally dump ammo on the ground.
On this topic though as a new DP-12 owner, it's very easy to get in a new rhythm as long as you're in that shoot, shoot, pump mindset... like shooting steel targets or pumpkins (the DP-12 got a lot of attention at the NES Pumpkin Shoot yesterday). But if for some reason you're shooting clays with it, you'll probably forget when you pumped last or fired the 2nd round in the time between clays (which happened yesterday too).
Not on the one that I tried out.
Then it was either broken or you were hitting the action release lever intentionally.
Otherwise, it won't pump until both shots are fired. No reason to spread misinformation.