I would agree that there is probably a convention holding a block of rooms right now. There's a pretty good chance that some rooms will be released between now and July, especially since you have a Bay Lake view. If it were me, I would be checking availability daily, at least online, so you don't miss out if the rooms are released.
Of course, you could look at it as a golden opportunity to try a different resort for one night - maybe a resort you've been thinking about but wondered if you would like. Maybe you could book a night at YC or BC and enjoy Stormalong Bay for the day. Maybe you could book AKL and enjoy the animals for a day. If you are only there one night and you don't like it, no big deal because you're moving the next day anyway. And you never know - you might just find a new favorite!