Adplugg widget only works in certain zones

Hello,

I have two zones where I run ads: a homepage zone and a right side bar zone (blog posts).  The adplugg widget works perfectly on the right side bar zone.  However, only 1 of two of my ads show up on the homepage zone.  I am not running any custom adplugg zones or placements, so its confusing.  All i've done is a drag and drop of the widget into the wordpress zones I want.

Thanks!