Read More Tag doesn't appear on Posts

Hi,
I think I’ve inserted the “read more” tag correctly in my posts, because the dotted line and more button appears in the editor and the <--! more--> tag appears in the text editor. However when I view the posts on the home page, there is no “read more” link. The text has cut off in the right place but it looks like that’s the end of the post, as there is no “read more” link appearing. Can anyone help?

This is my site: https://www.greenbyblue.com