Appointments+ Marketpress Integration "Add to Cart" Button

When creating the first appointment with Marketpress integration, the "Add to Cart" button shows up after clicking on the ".. confirm the appointment" button. However, I noticed that when I click on another date/time on the calendar for the second appointment, the "Add to Cart" button does to go away and it's still there. This is creating a bit of confusion during subsequent appointments because some users might click directly to "Add to Cart" button directly without clicking "..confirm the appointment" because it's already there.

Is there any way to hide the "Add to Cart" button when the user clicks on the calendar slot?