They're orbits, but not stable ones. Not even really ellipses. By the time it's made one orbit-ish motion around the planet, the moon has moved relative to it.

They're orbits, but not stable ones. Not even really ellipses. By the time it's made one orbit-ish motion around the planet, the moon has moved relative to it. The second go around it gets affected by the new position of the moon. Eventually the combined effects of the moon and the sun's changing relative positions will nudge it out of orbit.