Could advice steps necessary for setup of AMP mode of the Jevelin theme.
I did install AMP extension from Google and set it to Reader mode, but I cannot found any advices in documentation how to configure AMP to work automatically on mobile devices.
I hope you are well today and thank you for your question.
Please try temporarily deactivating LiteSpeed Cache and Automptize cache that you are using on your website and make sure that you are using below the latest version of the theme.