That's actually normal. 30 days is when many alter and finalize plans. They'll have multiple reservations on some things or decide to drop things totally.We're about a month out from our trip and I was surprised to find reservations available, as of yesterday, for Savi's lightsabers (multiple choices, on both of our HS days), build a droid (again, on both of our days), the MK fireworks dessert party (the one where you sit, didn't check the others), and Capture Your Moment photo sessions at all four parks.
It's always good to check at 30 days and again at 5 days and again 24 hours out. You can almost always find even the hardest to get reservations that way. 60 days is actually the worse time to look