لماذا تظهر جملة كلمة المرور غير مطابقة

PHP كود :
<table border="0" cellspacing="{$theme['borderwidth']}" cellpadding="{$theme['tablespace']}" class="tborder" align="center"><tr><td class="trow1" width="100%"><navigation></td><td class="trow2" nowrap="nowrap" style="padding:0px"><form action="member.php" method="post"><table><tr><td>{$lang->username}</td><td><input type="text" class="textbox" name="username" size="10" maxlength="{$mybb->settings['maxnamelength']}" style="width: 80px;" /></td><td></td></tr><tr><td>{$lang->password}<br /></td><td><input type="password" class="textbox" name="password" size="10" style="width: 80px;" /></td><td><input type="submit" class="button" name="submit" value="{$lang->login}" /></td></tr>
</table><input type="hidden" name="action" value="do_login" /><input type="hidden" name="url" value="{$redirect_url}" /></form></td></tr></table><div align="center"><table class="tborder" border="0" cellspacing="0" cellpadding="0" align="center" style="border-top-width:0px"><tr align="center"><td class="welcome"><a href="{$mybb->settings['bburl']}/member.php?action=register">{$lang->welcome_register}</a></td><td class="welcome"><a href="{$mybb->settings['bburl']}/misc.php?action=help">{$lang->toplinks_help}</a></td><td class="welcome"><a href="{$mybb->settings['bburl']}/memberlist.php">{$lang->toplinks_memberlist}</a></td><td class="welcome"><a href="{$mybb->settings['bburl']}/calendar.php">{$lang->toplinks_calendar}</a></td><td class="welcome"><a href="search.php?action=getnew">{$lang->welcome_newposts}</a></td><td class="welcome"><a href="{$mybb->settings['bburl']}/search.php?action=getdaily">{$lang->welcome_todaysposts}</a></td><td class="welcome"><a href="member.php?action=lostpw">نسيت كلمة المرور؟</a></td><td class="welcome"><a href="$settings[bburl]/search.php">{$lang->toplinks_search}</a></td></tr></table></div>