By default your section view will be set up so that what appears to the right of your alignment as you look from the lower station number to later stations will also appear on the right offset in your station views.
The picture below depicts what will be the right and positive side of your section view:
As you can see by default the positive offset is right:
This setting can be reversed by adjusting the style, but you may want to make a copy of the style instead of simply adjusting the style.
To reverse the offsets navigate to the graph tab within the section view style menu and select the Right to left option.
Once this adjustment has been made the positive offset will now be flipped to the left side.