Is a Level 2 charger really 100 percent better?

Normally when I charge my Prius at home it takes three hours, and when I initially plug it in, the Prius system estimates that it will take three hours to charge. And after charging it would say 13 miles.

Several times I would try using a Chargepoint public charger. I thought it being a Level 2 charger that it would take 1 hour and a half to charge my Prius. However once the Prius is plugged in it says two to two and a half hours to charge, not an hour and a half. The Chargepoint charger itself would say it is delivering 2.4 to 2.6 kw; the Prius would say it is receiving 1.5 to 1.8 kw. I have yet to fully charge the Prius at a Chargepoint charger, but the Prius would say "8 miles" after a 90 minute charge.

Is the Prius charging at a slower rate because I am charging immediately after arriving at the charger as opposed at home when I set the timer to start charging at 3 AM?