Can't Remove Twitter Default Image-Please Help

A few days ago I installed JM Twitter cards plugin to my blog but it wouldn’t “play nice” with my other plugins so I removed it.

Now when anyone shares my blog url or post-page url the twitter default image shows (on Facebook, etc,) instead of the post image or featured post image.

this looks horrible…
the plugin has been removed but I can’t find where to delete the image from or where it’s pulling the image from.

I cleared all cache plugins as well as my browser cache but it still shows.

has anyone had this issue and/or found a fix for it?
thanks.