Post the code of tblexp.php.
Type: Posts; User: karl94
Post the code of tblexp.php.
If the action attribute is empty, the form will be sent to the same URL of the form's document (https://www.w3.org/TR/html5/forms.html#form-submission-algorithm).
However the problem in your code is...
Can you post the PHP code in BBElec.php?
Could you provide the URL of the login page with some credential to test?