This morning in most of the U. S. was the Spring Forward time change due to Daylight Time. I knew about it, but forgot it changes the time of any scheduled posts. End result was my first post of the day posted an hour early and the other scheduled posts were also affected.
That’s why my first post showed up again after I changed the time. I fixed the times on the other posts for today. I hope one day WordPress decides to fix the problem or at least offer an option to take the time change into account.