Wrong count for failed alerts on front page

Let's say 9 alerts have been triggered, and 9 alerts show under "Fail" on the front page.

If the devices that caused the alerts are set as disabled (then they would not check for alerts), they don't show up in "http://observium.domain.com/alerts/" (which is good), but the count would still show up as 9 on the front page.

The attached image shows where the wrong count would appear.