Tweetmeme all up in my widget

On my blog I have the WP membership plugin installed and for some reason Tweetmeme's retweet button is showing in the 'Member Level Text' widgets. This behaviour only happens with that widget, so I suspect the problem is specific to WP Membership's widgets.

It only shows on the homepage and blog pages. You can see what I'm talking about at:

blogmembershipscripts.com.

Gary