Smartsheet Calendar - Render event to actual start & end dates

I'm creating a project visual-timeline using the Calendar App, but the tasks are spanning entire time periods instead of representing the actual task timeline.

Phase 1 completes on Sep 1st, but it shows running through the entire month of September.

Phase 2 starts on May 15th, but it shows starting on May 1st.

How do I make this more accurate?