I have had this problem myself and the solution is quite simple but hard to find :)
in catalog folder there is another .htaccess ( i presume you call the custom font from the theme ) you need to add the exceptions in that .htaccess file:
It should be like this after you edit it
Options +FollowSymlinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !^(.+)\.jpg$
RewriteCond %{REQUEST_FILENAME} !^(.+)\.jpeg$
RewriteCond %{REQUEST_FILENAME} !^(.+)\.png$
RewriteCond %{REQUEST_FILENAME} !^(.+)\.gif$
RewriteCond %{REQUEST_FILENAME} !^(.+)\.css$
RewriteCond %{REQUEST_FILENAME} !^(.+)\.js$
RewriteCond %{REQUEST_FILENAME} !^(.+)\.woff$
RewriteCond %{REQUEST_FILENAME} !^(.+)\.ttf$
RewriteCond %{REQUEST_FILENAME} !^(.+)\.otf$
RewriteCond %{REQUEST_FILENAME} !^(.+)\.svg$
RewriteCond %{REQUEST_FILENAME} !^(.+)\.eot$
RewriteRule ^(.+)$ /404.html [NC]
AddDefaultCharset UTF-8
And lastly there seems to be an encoding issue with your images, i do not know exactly where the problem might be, but it is certainly similar, maybe .jp is not in the rules above as it should be.
Hope i answered your questions :)