The aircraft in the FS Traffic fleet has been set up with the correct dimensions and airline codes as their real-life counterparts, allowing them to park at the correct gates at airports which also have the correct gate sizes and airline codes set up. If an airport scenery does not have the correct sizes and airline codes assigned to gates, then the AI aircraft will generate at random gates.

This should mostly be an issue at default MSFS airports which are AI-generated, but if you do find a third-party airport with this issue, we advise you to contact the scenery developer directly and hopefully they will be able to issue a fix.