I have uploaded a new theme to my WordPress. Randomly I started having trouble with it. On the home page, all my posts show up with a blank image (the image of the shoes was me testing something out - ignore that). Everything works except for the home page images. I tried editing the PHP, which is why there is the same picture repeated, but WordPress shows an empty PHP file for the index.php now and will not let me update the file. Every change I make gets erased and the page does not change.
I am brand new to WordPress and it is frustrating. Any help is appreciated. Thank you!