What is the one tiny flaw that instantly gives away an AI article?

I started noticing that every piece of machine written content has this unnatural symmetry every single paragraph wraps up neatly with a tidy conclusion, and there is never a messy edge or an unresolved thought. Real humans ramble change directions mid-sentence or leave opinions hanging. The moment I started checking for "loose ends" instead of grammar errors spotting automated text became effortless.

How do you usually catch AI content before it gets published on your site?