It has well documented stock issues and you expected more than it got? I am surprised it got as much as it did.
Yes, because supply issues means that the incoming shipments would be in higher than normal demand. The fact that the drop it showed was fairly normal for an JRPG (~80%) means that it's showing normal sales patterns despite pent up demand. Maybe it'll have better legs in the coming weeks (or they've moved to digital instead, which is why I wanted to see digital sales).