@escopecz that is the plugin that we have been testing. I am talking about the last change to this plugin, this one:
Added tracking of the logged in users
https://github.com/escopecz/mautic-wordpress/commit/9ef739c5d71fe0f7d1ef97973a14d8b8bbc5e530
When you access from the same IP with different users, for example new registered users in wordpress, the plugin does not work well, always overwrites the data from last user from this IP, even if you do it from different devices or browsers, including the private mode.