Fill in registration form and all filled information clean up

[florihana]

Hi experts.

Joomla 3.6
virtuemart 3.0.8

Process the problem:
1.go to registration page

2.fill information, with already registred email address : info@vacha-design.com

3.will show error message and all the filled information has clear up(see picture)

My question is: How do I keep those information and only show the error message

thank you for your guys kindly help