Import Plugin Entries Not Loading
I was able to get to the bottom of this and the problem was that 2 columns in my CSV file had the same name. 

If you have a similar problem check the "craft_import_log" table in your database. You will find the error reporting for the import plugin there. The error I received was "Columns and data did not match, could be due to malformed CSV row."

I ran my CSV through an online checker and it informed me that there were duplicate column headings. Renaming one of the columns fixed my issue.