There appears to be a bug on your website that is exposing other peoples data to customers (telephone name and address).
When i went to enter my City (Manchester) a popup box let me select 'Manchester (21 Riverside'. When i selected this it populated the boxes with the details of the previous customer including their telephone number.
I know the person concerned but i don't believe she has ever used my PC to order any goods. So i don't think this is a caching issue.
Please inform your website developers of this issue, it is quite serious.