login system wont log me in no matter what

Question

I am making a login/register system in php. For some reason in the login.php file i can not login any user. Bellow is the login.php file. I have the db connection and session start in connect.php file and any function needed in the functios.php file.

include("connect.php");
include("functions.php");
if(logged_in())
{
 header("location: profile.php");
 exit();
}

$error = "";



if(isset($_POST['submit']))
{

 $email = mysqli_real_escape_string($con,$_POST['email']);
 $password = mysqli_real_escape_string($con,$_POST['password']);

  $result=mysqli_query($con,"SELECT id FROM users WHERE email='$email' and password='$password'");
  $retrievePassword=mysqli_fetch_assoc($result);
  $count=mysqli_num_rows($result);

     if($count == 1)
     {
       $_SESSION['email']=$email;
       if($checkBox="on")
       {
         setcookie("email",$email,time()+3600);
       }
       header("location: profile.php");
     }
 else
 {
     $error="Emai or Password is inccorect, check again!";
 }

}






<div id="error"><?php echo $error;?></div>

   <div id="link">
       <a href="index.php">Register</a>
       <a href="login.php">Login</a>
   </div>

   <div id="formDiv">
       <form method="post" action="login.php">
            <label>Email:</label><br>
           <input type="text" name="email"><br><br>
            <label>Password:</label><br>
           <input type="password" name="password"><br><br>
           <input type="checkbox" name="keep">
           <label>Keep me logged in</label><br><br>
           <input type="submit" name="submit" value="Login">
       </form>
   </div>
</div>