I've never come across a simple digital USB pad with a delay, and all the ones I've hacked have worked just fine. Even the cheap $10 discount-bin pads.
Check all your wiring and solder points for loose contacts (use a multi-meter, not just your eyes). 99.99% of the time it's a bad soldering job that causes issues. Failing that, check all of your microswitches on your sticks (again, with a multi-meter).