I just installed this template and noticed there are some characters not diplayed.

For example, not quite sure how this will be displayed here, but I'm copying and pasting
Shipping�Sample Text�...

When viewing in FireFox, there is a little box with 'FF DD' after "Shipping" and another after "Text"
When viewing in Internet Explorer there's a question mark instead of the little box shown in FireFox.

Why does this happen?
I was comparing with stock files and noticed for the template 'en_US.utf8' and the stock file 'en_US.ISO_8859-1'
Does this have anything to do with it? Which encoding is better?

Thanks.