The thumbs for property page gallery were removed from responsive for lack of design space, and the slider next/prev arrows are used to navigate between the slides.

If you wish to add the thumbs – you can use this custom css http://prnt.sc/cnbm2u

Show circles:

@media only screen and (max-width: 640px){
.caption_control, #carousel-listing .carousel-round-indicators, .carusel-back, #carousel-listing .carousel-indicators, #carousel-indicators-vertical {
    display: inherit;
}
}