Amrik,
Likes and Sends don't always appear on your wall. Facebook now determines how the content should be displayed: Prominently on your wall or just in your Activity Stream (Timeline). If the count is increasing when you Like the page, that means the button is working.
To increase the chance of it appearing on your wall, I'd recommend using the URL Debug Tool to check your Virtuemart Test page and see if the title, description and image look right. If not, or they are missing, Facebook will de-value the weight of the Like or Sends from that page. The richer the content (more information), the more prominent your posts will be.
developers.facebook.com/tools/debug/
JFBConnect supports Open Graph tags for your site and can help implement them using our {SCOpenGraph title=xxx} tags. You can also use description and image in the tag to customize the tag for your page.
Hope that helps,
Alex