The Johns Hopkins data (used in your link) has had a lot of problems the last couple of days. They've been doing various refactorings such as switching from per-county to per-state data, and it's causing a lot of issues. (It's a bit alarming that the number of cases is so high that even the people just tracking the data are getting overwhelmed.)
I've been following their data for a while and I admire their work, but I've stopped believing their numbers without double-checking. (Yes, I've filed bugs.) In addition, the last day on the graph has always made it look like cases are tapering off because it's partial data.