Weekly overview misses details

Hey! I have a overview of my 3 phases in my house. And how come when I use the 7 days period it wont show me the actual values?
Because in this example I had ampere uasge of 27 A during a short period of time this thursday 05/05. But when I select the 7 days period it show that it was max at around 15A that day… how come? This make this overview quite useless if you want to use it to monitor the actual usage over time. Is there any way to fix this?