Thank you for getting back!
I investigated some things in your theme and think I found a simple CSS solution that will get the two working together:
.datepicker.dropdown-menu {
z-index: 1009 !important;
}
You can insert that in any of your theme’s CSS files. Or, if that is not something your familiar with another super easy way to do this is to download and install the plugin Simple Custom CSS and then paste the above inside of the plugin, and hit Update. Now go back to the problem page, and click Refresh. Does it work now?
Cheers!
– Brook