Yeah, there's no reason to have both tags. Only one will be used and if it's the first one then the second is pointless. The only reason for the IE=8 one to be there in the first place would be if there were issues in IE9 and 10.
It's not necessarily bad to have the IE=8 one in there. If your site works and there are no speed issues in IE then it could be more trouble that it's worth to have them solve the problems that caused them to use IE8 compatibility mode.