Search Engines Indexing Wrong Domain

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It appears that Google is indexing some of my sites pages on the discountasp.net domain. This is problematic because Google is probably treating this as duplicate content which is not good.

For instance, if you do a search for "printable wide receivers cheat sheet", the following page comes up:

cheatsheetw.web128.discountasp.net/fantasy-football/nfl/free/printable/offense/wide-receivers-cheat-sheet.aspx

but my page is found at:

cheatsheetwarroom.com/fantasy-football/nfl/free/printable/offense/wide-receivers-cheat-sheet.aspx