As explained many times already on the forum, we don't control the jetways or how they attach to the main door. We just use a custom model, which is animated by FSX itself.
It's very well known that the default FSX jetway animation is not perfect, especially with regard to the vertical position, sometimes the jetway wheels even sink into the ground, other times the jetway simply doesn't connect.
Nothing we can fix on our side in any way, other than rewriting the jetway animation system entirely, and replace it. Something for the GSX 2, probably...no, we don't have any timeline for it.