Confused about timesheets and billable hours

So I have a project set up, and I logged the time for three tasks: 20 min, 30 min, and 40 min. That's a total of 1:30.

But the overview page of the project says I have 2 billable hours. I deleted all the time logs and reentered, but it still says 2 hours.

I have no idea what to do next.