format appearance of blog articles

I generally like WordPress, and I believe I just successfully upgraded to the latest version without having a clue about what I am doing.

One thing that did not seem to change however, is the formatting in single post view, where above the viewed post title also lie the titles of previous and next posts. This is very inconsistent throughout, with the single page title sometimes appearing near the top and at other times further down the page, and the before and after titles all over the place, running together so looking as they are one, some all at the top, others extending down into the margin of the single post, some longer titles going right to the vertical center of the page, while others are limited to just the very right or left hand margins.

You can see what I mean by quickly browsing through some of the single posts at the site https://waggleweight.com. It certainly could be something I am doing or have done wrong. It does not look very professional for sure, and I need to try and find some way to correct it. Any suggestions would surely be appreciated. Thank you much.