Whenever you open a page in your Device, your browser stores that page in its local caching memory so that it does not charge network cost each time you reload your page.
In case after you upgrade your WCard and the new WCard fails to reload, press the Refresh button once. The new WCard should load itself up.
In case it doesn't display your WCard still, try closing your Current Browser and Reopening it again. Refresh your WCard page, your Upgraded WCard should be visible.
If you are still facing trouble rendering your upgraded WCard, please get in touch with us @ https://wcards.freshdesk.com/support/home.