Product quantity getting doubled if it has customization option while creating order via backoffice.

[J.Sahu]

While creating order in back office if a product has customization option then the quantity getting double after adding to cart.

To reproduce the issue. 
Add customization option for a product(I have added two customization fields and more.).
Create order in back office.
Search for the product.
The product will be listed.
Add the product the cart the quantity will be doubled.
Add any quantity and it will get doubled.
It is not happening if the pre added card is selected.
I have found this issue on a shop and tested with raw installation of the latest version of prestashop.

Please check a video I have attached to the forge.

http://forge.prestashop.com/browse/DOC-406