Hi Martin,
I have talked with our DEV team about this issue, they said "Testimonial Carousel Clients Ratings are intentionally hidden with template CSS. orbit-testimonial CSS class is used in the addon style settings on the homepage. Using this CSS class client-rating is set to hide.
https://prnt.sc/p2LJoRn7TRDf
This is the CSS from template.css"
.sppb-carousel-extended.orbit-testimonial .sppb-carousel-extended-item .sppb-testimonial-carousel-client-rating {
display: none;
}
You can set the CSS to display block, it may works on that.