That's just the Forum software mangling your code.
Here's some of the original code for reference (one extra space after the http to fool the Forum software). I don't see anything wrong with your code, but I'd try taking out the '# Force all pages' comment or moving it so it's not in the middle of a compound line.
RewriteEngine On
RewriteBase /
#RewriteCond %{HTTP_HOST} .
#RewriteCond %{HTTP_HOST} !^www\.example-domain-please-change\.com [NC]
#RewriteRule (.*) http: //www.example-domain-please-change.com/$1 [R=301,L]
# The Friendly URLs part
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?q=$1 [L,QSA]
------------------------------------------------------------------------------------------
PLEASE, PLEASE specify the version of MODX you are using.
MODX info for everyone:
http://bobsguides.com/modx.html