That happens because the script
that sets up the datepicker
<script src="https://stackoverflow.com/questions/35529308/data:text/javascript,(function(%24)%7B%24(%22.datepicker%22).datepicker(%7BshowButtonPanel%3Atrue%2CdateFormat%3A%22dd%2Fmm%2Fyy%22%7D)%3B%7D)(jQuery)%3B" type="text/javascript">(function($){$(".datepicker").datepicker({showButtonPanel:true,dateFormat:"dd/mm/yy"});})(jQuery);</script>
which in the home page is just after the form, is missing in the second page.
solved Problems reloading fields in a form [closed]