mod_rewrite - strange output

On a site using mod_rewrite I'm experiencing some strange output.

The main site are using the .htaccess file below, to rewrite url's - works fine...

But the subfolder /admin seems to inherit the rewrite behaviour even though this is not wanted - how can I stop this ?

RewriteEngine on
RewriteBase /
 
# Directories to ignore
RewriteRule ^(assets|inc|cms|css|images|img|admin|js|topimages|video)(/.*)?$ - [L]
RewriteRule ^(index\.php)$ - [L]  
RewriteRule ^(mod_redirect\.php) - [L]
RewriteRule ^(balule_mail\.php) - [L]
RewriteRule ^(login\.php) - [L]  

RewriteRule ^(.*)(\.html)$ mod_redirect.php?url=$1$2 [L]
RewriteRule ^([^/]*)/([^/]*)/?$     index.php?lang=$1&url=$2  [NC]
RewriteRule ^([^/]*)/?$    index.php?url=$1  [NC]

In /admin I have a file "login.php" - and it seems like every time I request that file, the server also streams the index file from the main site ?!?

So basicly, I'm looking for a way to stop the inheritance from the parent folders .htaccess file, is that even possible ??

Best regards,
Mark