Google consider HTTP and HTTPS as two separate protocols. Since the contents are same on both versions, google bots consider it as duplicate content. Adding a canonical URL will solve this problem. If you have any doubts, feel free to ask.
Moz Q&A is closed.
After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.