log in variable acts differently on different laptops

I created a course with the first slide acting as a log in so to fill a certificate on the back side. One variable requires the employee to enter their Employee ID. When I go through the course on my laptop, I enter four numbers and it acts accordingly (next button appears and I can advance). When I go to the laptops we set up as a lab and try, it will not advance unless I enter five numbers. Any thoughts? 

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