Jack's quite right - if you use PRE it shouldn't add spaces and should use a monospace font. (Though technically neither is mandatory - the spec says 'may' for both.)

The problem seems to be the way mudcat adds these <BR> tags with spaces after them. I don't know why it does that. (And I think they're invalid anyway in xhtml strict - they should be <BR /> though I doubt if any browser minds.)

My last post shows monospace on both my Android tablet and my wife's iPad - I don't know if that has courier. Mine is in san-serif like the rest of the site, which is my default font in Firefox for Android.