How Could This Be?

I tried to get a post done by Sunday, Mother's Day. So, I work in between jobs rushing to meet the midnight dead line that I had imposed on myself. I wrote about every thing I did and every thing that happened from Saturday morning to Sunday night.
I was in shock, when I publish the post, to see a warning in red print telling me that my post was plagiarized and that it was previously published. By whom? I ask myself. Who is living inside my brain besides me? How is this possible? How could this be?
Originality
The image of the flowers I took with my iPhone when I received them from my son on Saturday. He could not be with me so he sends me a beautiful arrangement of flowers. The image of the steps, mine. They are my steps on the back of my house the scene with the snow and the sun shinning thru the trees, is my back yard. So, why was I warned about the post being plagiarized when everything I wrote in it is my original work.
How To Fix the Problem
After spending all that time writing that post, I was not about to forget it and not publish it. I stop to think what I could do to fix it. The tittle was MY MOTHER'S DAY WEEKEND ACCOMPLISHMENTS.
I realized that the phrase MOTHER'S DAYS belongs to every one. For that reason I should be able to use it just as anybody else does. But it was the only thing that was not original.
I proceeded to change the tittle of the post from MY ACCOMPLISHMENTS ON MOTHER'S DAY WEEKEND " to ALL I HAVE ACCOMPLISHED THIS WEEKEND". Not happy! Since this post was intended for mothers'day. Nonetheless, when I clicked to publish it, after the corrections I made the post was published. I really don't understand how they arrive at their decision.
If there is anyone, in the WA family that knows the answer, please let me know. Perhaps I will be able to avoid the complications that comes with it.
Also, does anyone know how I can edit these post after they have been published?
Lydia
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I suppose that WA continues to hold some mysteries for us all. I am happy you were able to publish your post after all. Hamish told you how to edit so everything is back to normal. Nice that your son sent you a beautiful flower arrangement.
Stay safe and healthy,
Taetske