com_registration_login не работает корректно

 
<form method="post" action="" class="login_form">
  <div class="title">Вход</div>
  <div class="field">
    <div class="text">
      <input type="text" name="login" id="login_field" tabindex="1" placeholder="{$LANG.LOGIN} {$LANG.OR} {$LANG.EMAIL}" />
      <div class="icon_login"></div>
    </div>
  </div>
  <div class="field">
    <div class="text">
      <input type="password" id="pass_field" placeholder="" name="password" tabindex="2" />
      <div class="icon_password"></div>
    </div>
  </div>
  {if $anti_brute_force}
    {captcha}
  {/if}
  <div class="buttons">
    <input type="submit" name="login_btn" class="login-button" tabindex="4" value="Войти" />
  </div>
</form>
 

 
<form method="post" action="">
  <div class="lf_title">{$LANG.LOGIN} {$LANG.OR} {$LANG.EMAIL}</div>
  <div class="lf_field">
    <input type="text" name="login" id="login_field" tabindex="1"/> <a href="/registration" class="lf_link">{$LANG.REGISTRATION}</a>
  </div>
  <div class="lf_title">{$LANG.PASS}</div>
  <div class="lf_field">
     <input type="password" name="pass" id="pass_field" tabindex="2"/> <a href="/passremind.html" class="lf_link">{$LANG.FORGOT_PASS}</a>
  </div>
  {if $anti_brute_force}
    <div class="lf_title">{$LANG.SECUR_SPAM}</div>
    <div class="lf_field">
      {captcha}
    </div>
  {/if}
  <table border="0" cellpadding="0" cellspacing="0" width="100%">
    <tr>
      <td width="20"><input type="checkbox" name="remember" value="1" checked="checked" id="remember" tabindex="3" /></td>
      <td>
        <label for="remember">{$LANG.REMEMBER_ME}</label>
      </td>
    </tr>
  </table>
  <p class="lf_submit">
    <input type="submit" name="login_btn" value="{$LANG.SITE_LOGIN_SUBMIT}" tabindex="4" />
  </p>
</form>
 

 
Формы -->
 --> МОЯ
<form method="post" action="" class="login_form">
 
 --> Оригинал
<form method="post" action="">
 
Инпуты -->
 --> МОИ
<input type="text" name="login" id="login_field" tabindex="1" placeholder="{$LANG.LOGIN} {$LANG.OR} {$LANG.EMAIL}" />
<input type="password" id="pass_field" placeholder="" name="password" tabindex="2" />
 ----> КАПЧА
<input placeholder="Введите символы с картинки" name="<?php echo $input_name; ?>" type="text" tabindex="3">
<input type="submit" name="login_btn" class="login-button" tabindex="4" value="Войти" />
 
 --> Оригинал
<input type="text" name="login" id="login_field" tabindex="1"/>
<input type="password" name="pass" id="pass_field" tabindex="2"/>
<input type="submit" name="login_btn" value="{$LANG.SITE_LOGIN_SUBMIT}" tabindex="4" />
 

<input type="password" id="pass_field" placeholder="" name="password" tabindex="2" />

<input type="password" name="password" id="pass_field" placeholder="" tabindex="2" />