Catch Inspir Free – 3 columns not correctly on mobile and tablet display

Hello, On my homepage I created 3 columns three times (in total 9 covers to lead them to the other sides). The desktop version is perfectly. Unfortunately on mobile and tablet display they have no distance/empty spaces between the individual covers. Additionally, on tablet display appears 2 photos in one line, and the third one is separately (this is repeated tree times, because of the 3columns, I guess). Is it not possible that the fourth picture is on the same line as the third, so that I always have two photos on one line. https://ra-ar.aleferoc.myhostpoint.ch/wp2/ Thanks so much for helping me. Best regards, Kokobelle