Different calendar than I have. Interesting. :)
Long Gulch, thanks for pointing this out, and my apologies. It's highly annoying. The issue here is the system was configured to show the calendar such that the start of the week is a Monday. All red blooded americans know that the week starts on Sunday. I've fixed this across our website, including on the registration form. I know this has burned Yazoo in the past, because you can easily pick the wrong registration date.
Here is before and after:
(https://mtnmarauders.com/wp-content/uploads/2024/11/cal-fix.png)