Facebook business page and personal account security problem... need some advice.

I'm not sure if anyone else has encountered this problem but I've just opened a shopping/retail page on a Facebook account and am finding every time a private message is sent from that page the message defaults as being sent from the personal account holder rather than from the retail name.
At the top of the page you have the option of using facebook as the shopping/retail name or the personal account name and it is activating to use the trading name until you actually send a message or post on another page or wall then it just defaults back to the account holder, giving anyone who bothers to check the opportunity to access the private account wall and information.
Can anyone tell me if it's possible to stop/change this from happening as we feel it's not safe to let everyone who has access to the retail page to have access to the personal account.
If I send a person directly to the shopping/retail page and they like it, they have no access to any private information, the problem only occurs when a private message is sent from the page or if a post is added to someone else's wall. I hope this all makes sense to read and someone can help.