Contact getting incorrectly associated with Company

[RashmiDixit]

My application is integrated with Segment through which contacts and companies are created in Hubspot. (using identify and group calls in Segment)

Although I have the option to automatically associate contacts and companies disabled, Hubspot is updating earlier contacts with a newly created company on its own. The older contact only shows "Hubspot Calcucation" update in property history. Please note that the older contact has a different email domain from the newly created company. Also I have made sure that there is no incorrect association call going out from Segment.

I am not able to figure out what is wrong. What can I be missing? 

[webdew]

Hi @RashmiDixit ,

This should not happen if you have switched off the toggle for automatically associating contacts and companies. Would you mind going through this article once and trying it again?
https://knowledge.hubspot.com/crm-setup/automatically-create-and-associate-companies-with-contacts
If the same problem persists, then I suggest you ask for support’s help.
Because they can access your portal and can have a closer look into your problem. Here is a small video demonstrating how to reach out to support
https://www.loom.com/share/b7e1053062d44bc9b34ba7800ba565ed

Hope this helps!
If we were able to answer your query, kindly help the community by marking it as a solution.
Thanks and Regards.