No, it's been there for years.
Ok great..So you recently noticed the door had a gap at the left side ..? Correct..?..If so..Then you will need to either adjust the gear assembly ..#31...#32..Adjust the left side a few teeth in advance..Which will pull in on the left side of the door once closed. Or replace the slide rails.
the gap is at he top 12 inches on the left side.