Trevor Can't Select Mallard?

[Chao§pawN]

For some reason the Mallard is not in the list of airplanes to choose from when I'm at Trevor's Hangar, even though I definately bought it.

 

When I try to buy it from the website, it literally says I already have it unlocked.

 

Additional info: I bought it ages ago so plenty of time has passed, it's not that I didn't wait long enough or anything. I own every aircraft with every character and I'm well aware of the waiting time for purchases. I'm also aware Trevor can't own the luxor or the shamal.

 

In short I'm fairly positive this is yet another bug that can't easily be solved, I'm just wondering if anyone else has a similar issue since I can't find anything about it anywhere.