Im not sure, but it looks like the .form-group is in the same level as the form itselfe.

Is this true or just looks like this? The form-group should be tabbed inside of the form.

form(action='/admin/add-product', method='POST')
    .form-group.row.my-3
        label.col-sm-2.col-form-label(for='name') Product Name
        .col-sm-10
            input.form-control#name(type='text', name='name')
    .form-group.row
        .col-sm-10.offset-sm-2.my-3
            input(type="submit" value="Submit").btn.btn-primary