two conflicting user profile forms

i have two forms when a user edits there profile.

one is “twitter username”
the other is “twitter url”

and they both have the meta data of ‘twitter’ i cant find the plugin or source of the forms and i cant delete them by using

unset($contactmethods['jabber']);

is there a way to see the source of these forms? or change the metadata from one to ‘twitterurl’ or something