Is it a self hosted site? Provided you post the URLs of self hosted blogs you want deleted from your account into a forum thread like this one, Staff can do this for you. Please do that now as I tagged this thread for their assistance. Please subscribe to it so you are notified when they respond.
I just removed those website links for you, so you should be all set. :)
Normally, you can remove websites from your Gravatar profile by going to Gravatar.com > My Profile > Websites and clicking the “X” next to the website. Your changes will be automatically saved.
However, the special characters in your website links were causing some issues, which is why you had trouble deleting the links there. If this happens again, you can delete the websites by going to your WordPress.com Public Profile Settings page or to Users > My Profile in your WordPress.com dashboard.