to get two of anything needs three types. e.g.: Tool needs Toool if you type quickly. Same with hitting backspace too fast. Checked settings for anti-keybounce functions. Nada
Are the keys being pressed all the way? I have the same keyboard and have no issues with typing double letters or the same key several times in a row (but do have a heavy type, although these keys have barely any travel due to the thickness of the keyboard).