>why this tiny Gulfstream is flying oh so high at 41,000ft and flying this weird pattern?
Because he can. (fly @41k)
If the ADSB signal to the receivers drop out, weird tracks like this can be the result. That's not the actual flight track. Just connect the dots between the solid line track. Looks weird, but he just turned left heading North is all.
Thanks to all the volunteer ADSB receiving stations that make planefagging possible:
>https://map.adsbexchange.com/mlat-map/