E-Mail-Field not showing

I do have an issue with one side where the E-Mail field is not showing on the Testimonial view.

This is how the E-Mail-Field is entered:

https://www.dropbox.com/s/k9k00y7o5j4d7hl/Screenshot%202019-08-05%2013.25.12.png?dl=0

And this is how it is shown on frontend:

https://www.dropbox.com/s/l85k4uy0y6o3ait/Screenshot%202019-08-05%2013.25.37.png?dl=0

Under “views”, there’s no option to select E-Mail-Field:

https://www.dropbox.com/s/rpdrb8uf5u9fc9g/Screenshot%202019-08-05%2013.26.08.png?dl=0

Where’s my mistake?

As the page is still under construction, I can’t post the link to the website directly but hope the screenshots above are helpful.

WordPress is on 5.2.2.
Strong Testimonials is on 2.39.2

Theme is Pukeko Theme, build with Elementor – both are up to date as well.