@stojakovichana glad to hear the Header issue was resolved!
About your Repeater. It’s fixable! And it touches something deep in the understanding of sizing in Editor X.
In your repeater, you have a row that changes its size - the row with the picture in it. In such situations, when elements or grids are getting smaller, you may need to make sure that everything that relates to them, and their parents are able to resize with them. So you always need to check everything around.
In this case - check the height of the other rows in the repeater item. If some of them are in px, they might start to look very big in comparison to the row that is shrinking. So set them in a fluid unit as well (if you want to).
Now check the Repeater item. Make sure its height is set to Auto so it can grow and shrink with the content inside. Also make sure it doesn’t have a min-height blocking it from resizing at some point. If it will have some sort of set height, it will not shrink, and a gap will start to form between its bottom edge and the content inside it.
Next, do the same for the Repeater as well. In your case, the Repeater is stretched to fill the section it is within. So in itself it is flexible, but you also need to make sure the section is. So check the Section. It should also be set to Auto, with no min-height.
This practice is very important and will help you find problems in your layout in many other situations. Let me know if it helped!