URI not as expected after running controller function

[eluser]imcl[/eluser]
Hello friends,

Say my current URI is

Code:

mysite.example.com/profile/user

When I run the upload_avatar controller that's inside profile.php

Code:

//  mysite.example.com/profile/upload_avatar

    function upload_avatar() {
        if ($this->input->post('upload')) {
            $this->profile_model->upload_avatar();
        }
        $this->user();
    }

I expected that function to run and the resulting URI to be

Code:

mysite.example.com/profile/user

because of the last line containing

Code:

$this->user();

But instead, what happens is that the upload_avatar function runs OK, the page is reloaded as expected but the resulting URI now shows

Code:

mysite.example.com/profile/upload_avatar

Any ideas why this is happening?

Thanks.