Side Bar widgets displaying below when should be on right


Having a bit of a theme issue here. We installed CoursePress and hired a developer to do some presentation editing of it. However, we instead went with installing a subdomain instance of CoursePress instead. Whatever that person did made the single post display of blog posts display the right sidebar below all the content instead of on the right. Can you help me debug and correct this issue? Also, it used to display the featured image on the single post page below the title and above the content but now it doesnt show the image at all. Please advise at your convenience and thank you for your help.