Am I doing this wong?

[eluser]CroNiX[/eluser]
Use the form helper, form_open('controller/segment');, or, DON'T use a relative path in your form action (or css asset, or image, or javascript, or.... Relative paths get appended to the end of the current URL, but that's just a regular HTML issue.

Code:

echo form_open('form_do');

or

Code:

<form action="<?php echo site_url('form_do'); ?>" method="post">