Most recent two blog posts are disappearing and reappearing

My two most recent blog posts have been disappearing and reappearing over the past week. Every day, one of the two posts won’t show on my index page, but then the next day whichever one was previously missing from the index page will alternate and show up again. I have no idea what’s happening and this has never happened before.

Whenever the blog post will disappear, it won’t even show in my All Posts page or in the Stats page. But if I check on the site the next day, it’ll magically be there. Would anyone know how to fix this? I’m afraid of writing new blog posts only to have them not show up whenever they want.

Thank you!