I'm guessing you must have unplugged around 6:30? Otherwise I'd have expected to see it tapering off at least a little bit. What do you have your slider set to?
Using a supercharger, there is a lot of tapering off, from ~110 kW and downwards. Using only 7kW, it is flat until very close to a full charge. If you don't range charge, but only charge to your daily local commute, a 7Kw charging station wouldn't likely taper at all.