When I choose a parking spot through GSX menu, Terminal 5 Gate 57 is one of the parkings NOT having 'too small' at the end of their description.
As explained on the manual, the parking is considered too small or not, based on the parking radius compared against the airplane wingspan so, if the airplane has a very long fuselage compared to the wingspan, what might be not considered too small by GSX, is in fact too small. I said it looks too small, and it certainly is, based on your screenshot.
This, combined with what you (or the airplane developer, if that plane came with a GSX configuration file) have set as the "Preferred Exit", might result in the airplane being positioned too far, because the Warp Me will try to position the PREFERRED EXIT to be aligned with a stop position.
Of course, if you think you are going to use that parking with a very long airplane with a preferred exit on the 2nd door, you'll probably want to adjust the stop position to reflect this.