safari does not show pictures

while i can easily see all the pictures on firefox and crome (dont know about ie), on safari i cant see most of them. instead of the picture i see a small X. here is one example page:https://kalemagency.com/?page_id=1320

is it something related to the theme? if not what can be the reason of the problem?

btw, i cleared history/cookies before i check the page