Form post value between % 10 and % 19 replace codeigniter

[eluser]Unknown[/eluser]
Hi everybody.

i have very interesting problem and need help.

Code:

$config['global_xss_filtering'] = TRUE;
$config['permitted_uri_chars'] = 'a-üöçşığz A-ÜÖÇŞİĞZ 0-9~%.:_\-';

Code:

<form acti echo site_url();?>" method="post">
<input type="text" name="percent"/>
</form>

Code:

echo $this->input-post("percent");

Explain: When i posted form with percent value : %0 between %9 everthing ok. But posted between % 10 and % 19 dosen't work.

how can i solve this problem?