Good question! Thanks for all the info.
Change the last line to this:
RewriteRule ^(.*)$ bootstrap.php?url=$1 [QSA,L]
When you visit
/Fort/ there is an empty string for the rewrite to match, and you were matching
+ which means one or more characters, when there are in fact no characters, so it wasn't getting triggered. Changing to
* says zero or more characters which fixes the problem and will now match
/Fort/ as expected.