drupal 6 - Cart items missing after login, drupal6 with ubercart -

i using drupal 6 , ubercart latest version shopping site.

unfortunately selected items missing cart after login. message showing "there no products in shopping cart".

homepage : our products -> buy -> checkout -> login -> result in cart page = 'there no products in shopping cart.'

i have tried out more fixes, not working me.

for ref : http://www.ayurvedaonlineshopping.com

thanks in advance spent precious time.