URL changed in IE and chrome

I am working on small application ..where i need to create report in excel .on prview button it open URL

http://mis-srv/Report/report/act-mis...raphic-mis.asp in IE and chrome but it should be following

http://mis-srv/Report/MIS-CC-Demorgraphic-MIS.asp


I m facing problem in IE and chrome not in Firefox ..

any help ????