I have the round-off set up with "round up to multiple of 15 minutes". One of my tasks needed 2 hours and 9 minutes. My expectation is to round it up to 2 hours and 15 minutes, and invoice it accordingly. 

In the project overview page, this task is registered as 2 hours and 30 minutes, not 15 minutes. Already wrong. 

When I create an invoice, the quantity for this task is registered as 3 hours, way over than the reality (2h 15m). 

What am I missing?