Quoted from Rkrall:
Thanks, this actually looks like it might be a bad spring, not pulling the drop target down quick enough!
The speed the drop target comes down shouldn't matter, however sometimes the drop target will become gummed up and just needs to disassembled and cleaned for it to slide easier. Make sure the switch arm is below the plastic tab on the plastic drop target
Also you should have a plastic actuator guide (number 24 on the diagram and also shown with the red arrow), which keeps the switch arm correctly in place