System subscription status graph intermittently appears misaligned 

See screenshot:

![screenshot from 2013-06-06 10 38 55](https://f.cloud.github.com/assets/4116405/618548/14a40334-ceb7-11e2-8554-8958a5a8fb8d.png)

I was able to reproduce this in Chrome pretty reliably doing the following.

Tentative Steps to Reproduce:
 1. Login to Katello
 2. Go to the dashboard page
 3. Copy the link in the location bar
 4. Open a new tab, paste the link, and visit the page
 5. Note misplaced graph