Trouble with Hemingway

My blog (https://rankandfiler.net/) uses a modified Hemingway theme. The posts are no longer in a grid. Here’s the back story and my index.php code.

I previously (https://www.ads-software.com/support/topic/hemingway-theme-number-of-posts-on-home-page?replies=10#post-2863696) struggled with my Hemingway theme to get it show more than two posts on the homepage. Eventually I figured it out, and it looked great. This was the post that detailed all the changes I needed to make: https://support.warpspire.com/discussions/hemingway/37-more-than-2-posts-on-main-page/page/1. It required changing the code in three places before the homepage would show more than two posts.

Then I put up a new post, and suddenly the posts were no longer in a grid. Here’s the page:
https://rankandfiler.net.

I found if I modified the index.php code, I could reduce it to two posts, in which case they looked fine and grid-like, but if I upped it to three or more, the third post was always off the grid.

Here’s the code from my index.php, that I modified in three places to allow for more than two posts at once. Let me know if there are is code from any other file that might be helpful.

[Code moderated as per the Forum Rules. The maximum number of lines of code that you can post in these forums is ten lines. Please use the pastebin]

(Hopefully I got the backticks right this time for posting my code).