I did the reset that was recommended and the behavior persists.
Could be you also had a GSX.CFG file in the Simobjects\Airplanes\AIRPLANE_NAME folder, maybe because you downloaded from somewhere (not required, since GSX comes with its own configuration) and is still there ?
When you "RESET" the airplane configuration in the GSX airplane configuration page, it will only reset your own custom configuration, which is located under %APPDATA%\Virtuali. It will NOT reset a configuration that is located in the Simobjects\Airplanes\AIRPLANE_NAME and this is intentional, since that location is supposed to be used only by airplane developers to put their GSX configuration so, we assume those configurations are correct, which is why the Reset won't remove them, so you can still customize it, but you can always go back to the configuration that came with the airplane, and not with a "blank" configuration, which would be the case if we Reset everything.
But of course, if you downloaded a configuration made by someone, and perhaps followed the (wrong) suggestion to put it under Simobjects\Airplanes\AIRPLANE_NAME, this one will never by Reset AND it will always take precedence over anything we do internally in GSX so, if that one is wrong, there's no way to fix it, until you remove the GSX.CFG file manually.
So, check if you have a Simobjects\Airplanes\AIRPLANE_NAME\GSX.CFG file, and remove it.
Of course, the GSX airplane customization page will TELL YOU if you are using a custom configuration or the GSX internal configuration so, you could simply have checked this, without searching around for files.
I realize that you don't see it on your end
No, it doesn't happen here. See this video I just made:
but perhaps you might some some thoughts on what could be going on?
Could be you customized the vehicles starting positions for that Gate ? If yes, try to Reset them too, maybe you put the vehicles in a starting position that would force them to appear on the wrong side (they appear exactly where you told them to appear) and make a 180 to be in the correct position.
Is it a SODE thing? Should I completely reinstall FSDreamTeam stuff first?
No, SODE doesn't have anything to do with this.
FSDreamTeam products bring a lot of value to my simming experience, but it wouldn't be completely hysterical to point out that the couatl ecosystem can be quirky.
Your problem doesn't obviously have anything to do with "Couatl"...it's just a matter of understanding where GSX is reading its configuration from and why it works in some way or the other, and the final answer is there's always a REASON why it does that.
Is there an update log I am missing other than the html file that was last updated in May? BTW, I have the same problem another user has in that, on the hard drive, that file hasn't been updated since 2017.
The Release notes shows the last update was July 11th:
https://www.fsdreamteam.com/couatl_liveupdate_notes.html