Outputting 2 duplicate courses for a total of 14 when slider is set to 12

Not sure why but our course slider is outputting 2 extra courses for a total of 14 when it’s set to show only 12 total? Do I need to rebuild the slider or do I have to modify the php code to get it to output correctly? Not sure how to fix this. See menu here: http://inletgrovehs.com/2018/
A sample is here scroll down to CAREER ACADEMIES section. Thanks in advanced!

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