Excessive space at end of text and images in mobile view - blank grid

Hi I have built my website but in mobile view content is in the wrong order (I know how to fix that now) but also many of the text and image or video boxes have 100+ rows of empty space at the end. I am having to manually lift the bottom of each text box/image box to remove the excess space which then leaves 100+ rows of empty grid between text/images boxes. How do I fix this issue or find a quicker way to remove excess blank rows at the bottom of text/image/video boxes and the empty grids.

Thanks

Susan