Your first "statement" is a word for word copy from this FB Post

Today's dental trivia: The tongue is the strongest muscle in the human body and the only muscle in the entire body that is connected on one end only.

You just left out the "strongest muscle in the human body"... How can you not understand why they would flag that as plagiarism?

The second factoid about Okinawa is rather well known.

Where did you get your photo images? Did you cite sources for them? Even if they are public domain or Creative Commons (CC) images, you still need to link out to the source.

Couple of years ago I had issues with steemcleaners, since I've been linking out to ANY quotation or image, they've not bothered me.

I had some problem with mackbot a few months ago, I went to them in discord and complained that I hadn't done anything for the downvotes, and they were reversed.