It could just be that for whatever reason, the restaurant hasn't dropped the ADR's yet. I don't know if it's a tech issue, or something else, but a few months ago I ran into a similar issue with Crystal Palace. I was on 6am, we had a 9 day trip, and Crystal Palace had absolutely zero availability for breakfast at any time over the length of our trip. Meanwhile, there was plenty of availability at Topolino and other hard-to-get spots, so I thought something was up. I even called customer service, who put me through to the IT department, who said there was nothing wrong and that "character breakfasts are in high demand." I hung up like, yeah I know that, but I also know that this is WEIRD. I've done this enough times to know this is not the norm.
Anyway, I set a reservation service alert and waited. About a week and a half later, Crystal Palace dropped ALL the breakfast reservations and my phone was blowing up non-stop.