Datepicker not opening

Hey there,

it seems this plugin is exactly what I′ve been looking for but unfortunately when setting up a datepicker input field on the billing page of woocommerce there seems to be an issue with opening the calendar. When I click in the input field in order to select a date the calendar doesn’t open up – instead you see a small empty box below the input field.

Any advise how to fix this?

Kind regards
Joen