Incomplete/Open orders

It's happening only to few of my customers, but when they submit an order with credit card information, all they see is a white page with gibberish letters all over the screen, instead of a confirmation page.

On our end, we see an open order with no c.c. info attached to it.

Also, the weird thing is, the subtotal + shipping charge does not match the order amount.

Please help.

Sounds like you've either been hacked or you've got something wrong with your payment processor.

If it is indeed 'gibberish' , chances are it's a hacking attempt.