No, all of them are going down. Here is what graph should look like, green lines are tension rods (time scale is longer, but idea is same):
And here is today’s graph. Sats in the red circle look dead and are in random attitudes, decay depends where solar panels are pointing → different drag, greens are deorbiting. (I added the Reds and Greens, and are not in the original graph Index of /space/con/star)
Those satellites were at orbital speed. They wouldn't de-orbit unless SpaceX wanted it to happen. It is possibly because there was an issue with the Hall Effect thrusters but it could be something to do with some other aspect of the satellite.
Satellites are deployed at low orbit where atmospheric drag is quite high, example tie rods come down less than a month. Also actual astronomer (Who's site these graphs are from) says that it looks like natural decay: