Book multiple appointments issue

Hello,

I have a question regarding multiple booking:
URL: https://uqcricket.com.au/pick-a-coach/

I’ve got an error at the time of “Book multiple appointments” for Repeat/daily. It’s shows the correct till we choose 4 sessions.
When we choose 5 or more, it shows 1 session less.

Please refer video for more understanding : https://www.awesomescreenshot.com/video/10889025?key=86c91592d496fceee668e301590d2d71

Thank you.
Ketan

The page I need help with: [log in to see the link]