In January 2021 Facebook announced that they are removing "likes" from fan pages. The statement, copied from their official blog can be found below.
"We are removing Likes and focusing on Followers to simplify the way people connect with their favorite Pages. Unlike Likes, Followers of a Page represent the people who can receive updates from Pages, which helps give public figures a stronger indication of their fan base."
You can read more about this change on the Facebook blog.