Sheet View 'user' is changing "Default" view

Hi There,

I have a file on OneDrive with ± 10 users accessing it, I have their own sheet views setup so they can filter, etc. without annoying the higher powers and other users.

The problem is that one of the Sheet Views I setup for a user is changing the filters in the default view.
How do I make sure that default stays as is and all the user views only change their own views?