UISplitViewController将详细信息视图推送到表/主视图上

I'm having this issue where in landscape mode on an iPhone 7 Plus when clicking on a cell in the table view on the left side of the device the content gets displayed on top of the table view, or replacing the table view. A split view controller should display the content on the right side in this case. The old content still seems to display on the right side as well.I'm having this issue where in landscape mode o