You need to remember that satellites with electrical thrusters change their delta vee (effectively the amount that they move) VERY VERY slowly - the impulse the electric thrusters give is tiny compared to conventional chemical thrusters. It may just be that the satellite tracking sites are not really set up for tiny changes in orbit.
We already know the sites are only updated every few days - how many times have we seen satellites "jump around" or "overshoot" a new orbital position Dozens & dozens - because the tracking sites are only designed for birds that have regular predictable orbits. As soon as a satellite is being actively controlled and manoevered the tracking is broken for a few days until it slides into its new slot & the tracking catches up with its new orbital parameters. So I very much doubt 13F is "moving around" in reality.