Url rewrite problem with htaccess when pointing several domains on one account on virtual server

I have three different domains for a restaurant web site. One part of website is in English, one in Finnish and one in Chinese. Language related parts are published on their own subfolders on one single virtual server account.

I have three domains: .fi, .com and .cn. Traffic is re-directed to proper language spesific subfolder depending on domain chosen. However I need/want to hide that subfolder on url-path.

Everything is working just fine expect when working with one feedback form. Please feel free to try the form yourself to see the problem live.

You can see the problem by trying the form with long address http://www.wokkipannu.fi/finnish/yhteystiedot.php (this is working, even the form processor). However using address which also should function http://www.wokkipannu.fi/yhteystiedot.php, the form resets after submitting and do not transfer to thank you -page like in first case.

There must be some rewrite-relate problem. Code from .htaccess is attached below.

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RewriteEngine On
 
RewriteCond %{HTTP_HOST}  wokkipannu.fi$ [NC]
RewriteCond %{REQUEST_URI} !^/finnish/.*$
RewriteRule ^(.*)$  /finnish/$1 [NC,L]
 
RewriteCond %{HTTP_HOST}  wokkipannu.cn$ [NC]
RewriteCond %{REQUEST_URI} !^/chinese/.*$
RewriteRule ^(.*)$  /chinese/$1 [L]
 
RewriteCond %{HTTP_HOST}  wokkipannu.com$ [NC]
RewriteCond %{REQUEST_URI} !^/english/.*$
RewriteRule ^(.*)$  /english/$1 [L]