Probably just poor design. Mechanical switch keyboards are the best, but tend to cost quite a bit more. This one is probably like most keyboards, under the keys is a big plastic or rubberish sheet with a bunch of copper lines. When you press a key it causes the two lines under that key to contact and that generates a signal to a chip that translates into a key code that represents a give key. You could probably pop the key off and take a dremel tool or some sand paper and sand the end down a little, test and repeat until it's less sensitive.