If your user sees two companies in their account, it’s because when they first log in using their phone number, a default company is automatically created for them. Later, when you add them as a user to your company, they gain access to your company as well. As a result, two companies appear in their account.
If you want them to see only your company, you can delete the extra (default) company by following the steps in the link below:
Web/desktop: How to delete the company in swipe on web?
Mobile: How to Delete a Company Account in Swipe Mobile App?