No Form Fields display except testimonial

It’s a conflict with your theme. Try this custom CSS:

.strong-form .text {
    position: static;
    color: #000;
}

You may also like this:

.strong-form input,
.strong-form textarea {
    padding: 4px;
    margin: 5px 0;
}

In case you’re not familiar, custom CSS can go in the Additional CSS section of the Customizer or use a plugin like Simple Custom CSS and JS.