IF your are tracking the explorestars display might flip back a forth 1 arc second. What you have to watch out for is the RA changing every second in a consistent way increasing or decreasing. Realize that when you are tracking the mount is constantly moving, but the RA is not changing if the ount is tracking. The az and el are constantly changing while tracing in an equatorial mount.
So if you are saying the RA is flipping back and forth by one second while tracking then things are working fine. Remember it is displaying stuff with finite precision so if you are right on the edge of the round off you are gonna see flipping around..
Wes, Southport NC
EXos2-GT PMC-8, iExos 100
ES ED 127, 10" LX200GPS+wedge, Astro-Tech 8" Newt, ETX-90, 60mm no-name guide scope ~ 260mm FL
Polemaster, Orion ST-80 and SAG, ZWO 290MM, D5300 astro modified
Nina, Bootcamped Mac Mini control computer, RDP to iMAC
110 amp hour lead acid deep discharge battery for field power
Electrical Engineer, Retired