I can't say for certain, but it looks like the problem is being caused by the "Markdown Styling Guide" link - my suspicion based upon how this lines up with where the content is getting cropped.

Would you mind logging in to https://steemitdev.com (it's Steemit Inc's test server that's hosting the old site) and seeing if the same thing happens there please?

Does this only happen in Kiwi Browser or is it all browsers?