Sent you a reply to your pm about this

I took a look at your source code.
You have them all set to link rel="stylesheet"
Leave that one, in your header code, set as link rel="stylesheet"
All of the rest of them need to be: link rel="alternate stylesheet"
Leave it to me to confuse a computer I resent you back the "what I think it should be" ( we see where my thinking got me the first time around

) so could you let me know?
You need to decide which one is going to be the forum's default stylesheet.
Set it as the default in Manage Styles using the style picker.
So the denim one I rename as default and edit the code and portal information where it says denim to default?
Edit: The screen as the space one still looks like the graphic above but that could be because of the "default" thing?? I will do that now.