Double post showing

Hello,
1. Url : https://betterbodybootcamp.ca/
2. If I delete my post, an annoying date “Jan 70” shows on my homepage.
3. When I add a new post, it will appear as second post on my homepage with the correct date.

The problem is I can’t delete the annoying date which appears as my first post. When I go to “all posts” in my wordpress dashboard, all I can see is my new added post. If I edit the annoying post via my website, I found out that the post & the permalink is the same as my newly added post.

Can anybody help please.

Thanks in advance.