Min Height Calculation not working

Hi, thank you. I tried to capture it. Now the shrinking is fairly slow, sometimes is a lot faster, and whats weird is that if I have already added a photo for example to the section, it will keep shrinking in the editor, but you would basically see the right size of the screen and the photo in the preview. Other times it would loose the section in the preview and in the published version as well. I have tried to make a workaround by assigning a one row grid to the section with a same calculation for the row height and its not displaying this behavior so far. But its not giving me the right height of the section in the published site - I am having a larger bottom margin under the photo, that I dont see in the the preview ( in the preview the section and the photo are having exactly the right height with a bottom and upper margin of 30px converted to % and everything is responsive). But this seems to be some other issue… Its a fairly simple page, but this small things are driving me nuts as I can not solve them…