Fixes for a Presta shop

Good day to everyone. I have a friend who needs some fixes made to their currently active Prestashop site. These are: 1. Currently if someone selects a size, for an item, it will appear to load correctly but when they get to the checkout it will fill out a completely different size - sometimes this can even be a size which is out of stock. 2. When people enter in a 'referrer' email address, this address bounces back through to the admin with the message of... ========== This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: ========== If you 100% know Presta and 100% can fix these two issues immediately, I would love for you to bid on this project. *Please only bid if you can start now* I will be awarding this project as soon as I find someone who I believe is well suited, so don't leave bidding until another time. I will not be creating a milestone, as they are a pain to get back if you don't fulfil your duties, so please don't ask; as this should be a pretty simple job for an expert I couldn't imagine it will take too long to complete. As you can see from my feedback, I pay quickly and leave feedback quickly and I am not here to try and stuff anyone around. I look forward to hearing from those who can fill the above. Cheers