Paid Gift Card Plugin, Date Selector error

We’ve paid for and implemented the WooCommerce Gift Card Plugin. All fine except for on the date selector if you want to send the gift card in the future. You select the date and it displays as 14S December 2020, instead of 14th. This is entirely managed by the plugin so should be nothing to do with our code. I’ve contacted their support twice and had no reply and I’m not sure how else to contact them, so trying here!