Ok, see the following situation:

1) your users have the enabled  cover upload

2) you uploaded the default cover for the view profile persons in the mentioned area (Studio->Pages->Persons->View Person page->Settings->Cover).

In this case, all users will have the default cover on their pages like page/view-persons-profile?id=1. If you also need to have this uploaded default cover in the page/persons-home then you need to change the background image URL for the following CSS class:

.bx-cover-wrapper {

    background-image: url(../images/cover.svg);

}

via the Custom Styles area of your template.