We discovered a pagination issue when viewing a course category and there were more courses than the max display on a page. We fixed this in Fordson version 1.5.2. If you have more courses than the "coursesperpage" setting they will properly show in pagination.
To the best of my knowledge, this will unfortunately affect all versions prior to 1.5.2 and Moodle 3.3.
As a work around you can increase the setting under courses "coursesperpage" to match the most courses in a single category. Then all the courses will display. Otherwise, upgrade to Moodle 3.3 and use the latest version of Fordson.