There was an error a few days ago (give or take) where a visual bug showed extra seasons as being unlocked when they actually weren’t. That was since fixed. If you didn’t buy the deluxe edition or an edition that comes with the now current season (which your edition didn’t) then you’ll have to buy this current season when that option becomes available.
I've had the same sort of issue. I did buy the deluxe, and it showed I had the season passes for 14 and 15. Since the reset I've not got it. Is there some way of checking this? Or of sending Bungie a ticket?