Re-prompt issue after passing parameter at URL

I am planning to put my a prompt report link on a web application, adding “&p_Languagecode=English&run.prompt=false” at the end of the URL link. It works fine after I click the link, then after I hit the triangle button to re-prompt, then the “Languagecode” parameter didn’t work, it shows all the languages possible.

So is there any way that I could solve this problem?

is it expected behavior or I am missing something here? Very new to Cognos, so any comments will be greatly appreciated.