multiple ssl certificates (one for each domain)

[ephigenie]

You need to have one IP address per Certificate since the NameBasedVirtualHosting functions on the fact that the browser sends the target domain name in the first http - request.
With SSL, there must be an SSL Handshake FIRST

this means your browser sends a generic connection request at port 443 to the ip of your server and trys key-exchange (to exchange certificate information and to agree on encryption algorythm and encryption depth) at this stage the certificate must be validated before any other transfer continues.
This means that there's no way to send the "first http request" to a ssl secured webserver and this server knows which domain you want.

Thats why you get the second cert on the domain of the first cert. Just because there can only be one active.