Odd little time shifting

I’m sitting here imaging M13 and in the “Telescope” window it says the mount will flip at 12:01. What I find interesting is that time flips back and forth between 12:01 and 12:02. Obviously, its not a problem, but I wonder why it goes back and forth.

Probably a rounding error or something in the estimation is wondering around a little bit based on dither time or something.