When using the side-by-side mode of Agenda view, the timeline on the left-hand side is not shown, which makes it kinda hard to see what time the events start at. The timeline is displayed in the merged view, so it's probably just some wrong condition somewhere.
Notice the timeline on the left side of the agenda view and red line indicating the time at which the mouse is currently pointing:
Both the timeline and the red line are missing in the side-by-side view: