Empty dropdown list width not properly rendered in IE 10 browser

Hi, I have an issue with my page not rendered correctly when viewed in IE 10 I found below instructions and did the configuration in IIS 6 to emulate IE 8 (that is, for the IE 10 browser to render the page properly as they say): 1.Click Start, click Run, type inetmgr.exe, and then click OK. 2.Expand the server you want and then expand Web Sites. 3.Right-click the Web site you want and then click Properties. 4.Click the HTTP Headers tab. 5.Under Custom HTTP headers, click Add. 6.In the Custom header name box, type X-UA-Compatible. 7.In the Custom header value box, typeIE=EmulateIE8. 8.Click OK two times. It fixed my menu though, but the empty dropdown list in my form kind of eased in, it got smaller compared to the other dropdown lists on my page. I checked with dev tool and used IE 8 browser mode, it didn't resized itself. I'm a little lost now, haha >_< ...