required feild validation not working after uploading wordpress site in server

hello mm,
my local machine vfb validation working fine but not working in live server so please help me,

when i click on submit button page redirect and display message family name is requird field. but i want same page validation message display on each field.

my site link
enrolment-form click here

and my vfb version is Version 2.8

i hope your reponse

https://wordpress.org/plugins/visual-form-builder/