In Jmix 1.6, I am seeing many user sessions appearing for each user

I have a webapplication in Jmix 1.6 and seeing something really unusual :
For some reason I see many user sessions replicated for many of the users.
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Has anyone here ever experienced that ?
What could be going on ?

Hello,
yes this is looking strange.
A user can login from different machines and it will create another session.
Are this sessions coming from the same IP?
Did you modify anything in the login process, session screen, are you using REST, is there an automated testing tool that is connecting to your application?
What happens if you terminate their sessions?

Kind regards,
Mladen

After doing some tests, I now realize that these idle user sessions are created every time an external REST API call is made to the application