That is interesting, I use Stellarium, I don’t know the explore stars app operation. Could it be backlash (play in the gears) when after it does the meridian flip if you going east to west.
Just starting in this Hobby, I have been doing wildlife and landscape photography.
Exos2-gt PMC-8, Celestron Alt/Azimuth
Celestron SLT 130, Olympus 7-14,12-40,40-150 Pro and a Canon FD 500L
Olymous om-d E-M1 Mkii,