So, I’ve found that this behavior remains on other carousels as well. So I think problem because of some settings or another plugin. But I haven’t found why yet.
CSS workaround in case anyone else encounters this behavior:
.swiper-slide:before {
content:"";
display: block;
position: absolute;
width: 100%;
height: 100%;
z-index:2;}
Thanks for your prompt assistance!