Need formatting help

Hi. I had to redo my site a bit and have a new template. I sized the header image and the navigation image to the sizes from the template and replaced them with my own. Now the navigation image doesn’t show up properly and both the right and left columns don’t appear unless you scroll way down. If you scroll down, you will see what I mean. I am not very good at trying to fix a problem such as this and don’t want to randomly try things and screw it up worse. I did not do anything as I don’t know what to do. Here is my website addy:
https://liquidconfusion.net

To see a screenshot of the theme to see placement of images and categories:

https://themes.wordpress.net/?view_type=filmstrip&item_type=latest&page_number=64&count_per_page=32&previous_view_type=slideshow&previous_count_per_page=32

I sure hope someone can help me with this problem. I sure do appreciate all the time you put in volunteering for us newbs here!