[HEPL] Referenced AMP URL is self-canonical AMP

Dear Experts, After connecting my new website to webmaster console, it showed this error "Referenced AMP URL is self-canonical AMP" for 2 AMP pages, also i found 2 URLs indexed on google one is non-AMP version and another one is AMP version. So kindly help to solve this problem.

Note - i am using Rank Math SEO plugin

Thank You.

Sorry for my bad English.