As the bookmark document path on the server is generated from the MD5 hash of the URL (so you can fetch an existing one merely by knowing the URL), Webmarks currently creates a new document when updating the URL. But it doesn't delete the existing one, so you end up with two documents, one using the old URL and one using the new one.
As the bookmark document path on the server is generated from the MD5 hash of the URL (so you can fetch an existing one merely by knowing the URL), Webmarks currently creates a new document when updating the URL. But it doesn't delete the existing one, so you end up with two documents, one using the old URL and one using the new one.