I would doubt it is a design fault otherwise they would have rectified it by now.
Remember that the first time that card slots are used they can be extremely tight. Are you sure that the cards are fully pushed home? I can recall loads of problems a long time ago with ISA cards being very awkward to fit properly. With PCI and AGP cards thay are just as difficult but I'm used to them now. It sometimes seems that you are going to snap the motherboard so what I do is a "dry run" before I install the motherboard, I place it on a firm surface and insert a card into each slot to loosen it up a bit.
Hope I've understood this correctly and hope it helps.