Website Cloned to Other Domains on Same Server after SSL implementation

Hi Folks,

Stuck in a strange situation. Recently I switched my website from http to https.

Here are the steps I follow:
I prepared myself for the transition, taken backup of complete website, purchased and implemented SSL certificate in my website i.e. example.com and in last, done redirection process through a Drupal's module.

All were successfully done, but today I noticed a thing which is out of my head and that is My website example.com is automatically get cloned to other domains parked on same server.

There are around 10 domains parked on same server, 2 of them are:

example2.com & example3.com

when I open above mentioned sites with http they show their real content but when I prefix https e.g. example1.com/ & example2.com/ they render same copy of example.com.
This happened with all parked domains on same server. And most socking thing is that I only implemented SSL for example.com.
How other domains on same server are accessible with https? How the copy of example.com is automatically integrated with other domains?

I don't know how this happened, please help me to resolve this. Any help will be appreciated.

Thanks