A few days ago I posted a post in the Fleet Quantity bug thread that it wasn't fixed, I'm not sure if any of the admins looked at it, but since I was given no response and the bug is still around, I thought I make a new post for it.
Essentially what is happening is the following;
I have five fleets, one for each of my 5 hubs and then a 6th one for aircraft that I am selling or leasing out. The one for leasing/selling is showing up at 0, while I do have 2 aircraft in it right now. I have tried to reassign them, then put them back in the fleet, it still shows up at "0" in the view/buy screen.