My static frontpage does not show the content

Hello;

i want to make a new page and it is to be the frpnt page of my site. there will be 4 or 5 topics on this page created manually in it so it will not change. my problem is that; i put some table and the pictures in it with 2 subjects. when i want to add third subject at bottom my page goes blank. if i add it to top then my page shows up again. how could i fix that problem?

site is https://www.astroenerji.com