Its what I mention, when there are no results there is no ajax container.
So you need to add your ajax container to your no results template.
As mentioned this setting can be found:
your ajax container
defined in the display results
tab.
in S&F admin area.
So this page (which shows no results):
https://www.erasmuspeople.com/rooms_and_flats_rome/?_sf_s=sdfsdf&_sfm_price=960+960
Does not contain the ajax container, so the message can’t be udpated.
Also note, your no results page layout is completely different, so anyone navigating to the link directly:
https://www.erasmuspeople.com/rooms_and_flats_rome/?_sf_s=sdfsdf&_sfm_price=960+960
Will not be able to able to use the search form, perhaps it might be worth considering styling these pages too to match the search area layout – if you are not sure how to do this you will likely need to get in touch with DIVI.
Best