It seems AMP plugin shows raw Latex expression. For example, I have this page which uses Latex as of now. The latest AMP plugin is version 1.0-RC2. Really hoping it will be fixed 🙂
Update on Dec 10, 2018 AMP plugin reached 1.0! However, the Latex problem didn’t fix. Instead, I found WP QuickLatex plugin fixes the problem.
Update on Dec 18, 2020, WP QuickLatex plugin creates AMP errors (it is possible that I misused the plugin), I started using AMP MathML, the native MathML for AMP, instead.