I fitted Origin Bifold doors about 8 weeks ago and am very happy with them. However, I've just noticed that when pushing the handle up to activate the multipoint locking, it's only the middle and lower locks that activate; the top ones are present but do not activate when pushing the handle up. I'm not sure if it's always been like this and I've just never noticed, or something has recently broken; either way its not right. Anyone had any experience?