Welcome to steem! Or sounds like you've been here for a while, but welcome anyways!

I see the one image needs to be centered.
See this: https://pastebin.com/inchfx2D you can use that markup to centre your image.
This is what it looks like when you centre the image:

Btw see this article, I always use it as a reference for formatting:
https://steemit.com/steemit-help/@krnel/how-to-align-images-in-steemit-posts-left-right-and-center