Duplicate page title "?showcontactForm=Y"

Anyone know what this is, getting duplicate page title errors in GWMT on some pages. The pages that are duplicate show “?showcontactForm=Y” appended. Any ideas why this would happen and how to stop it???

For some reason the Back in stock modification by Thom was adding this to links that the search engines pick up. I removed it from a template “buttons_block.post.tpl” to see if it clears it up. Not sure what this function is for yet so I do not advise anyone to do it yet if they are using the Back In stock mod…I will post here if it fixes the issue and does not affect functionality of the module. Thom may have more input. Thanks.