Webform Datepicker not functioning

Hi,

A couple of days ago, I updated my development server to version 13 and have been going through everything to make sure that it all functions as intended before updating my production server and one issue that I have encountered is that the datepicker does not display on webforms (it does display in the corresponding document). Is there anyone else who has encountered this issue and has managed to resolve it? Any help would be greatly appreciated.