How do you set up plug in properly?

When I try to test out my plugin by booking a party it will only let me pick the first time slot available. For instance I have it set up so a customer can only book an appointment on the weekend (fri-sun) and during specific times (i.e. 12, 1, 2, 3,4 pm) When I click on Saturday I can only pick 12pm. It says 1,2,3,4 pm are booked however there are no appointments there. Did I set up my settings wrong?