It's not clear what position are you referring to, and it's not clear what kind of bad positioning you are referring to.
- Are you referring to the position the GSX marshaller guides you to ( or where the GSX vehicles are positioned ), or the position you find yourself at, after using the "Go To Airport" menu to go to a gate ?
- Is the position looks basically correct, just the airplane too forward or too backward, or the position looks entirely off.