Accuracy of the Email Click Activity Report

Hello. I had a question regarding the email click activity report. Can we only measure the clicks on a hourly basis? For example, the spot in red below is where the campaign launched. It launched at 11:30 and yet you will see that it has the whole hour (from 11-12pm) marked as red. 

This is not entirely accurate since the campaign launched halfway through this time slot. I could not find filters that changed the hour time period and wanted to know if anyone knows if this can happen.