New user owns old apps in Mac

I just created a second user in my computer so guests can use my Mac without the need of using my account. I did this through the GUI (Settings → Users → New User). While trying to set up permissions and restrictions. I can see that this new user is shown as owner of some of the Applications in my Mac. - Why is this happening? - Should it be happening at all? - Is this Unix related, or macOS related?