Strictly speaking, it is not switching – it is the displayed value that appears to switch.

The clock value has no numbers after the decimal point, so all this means is that the clock value is on the edge (changeover point) between 44101 and 44102.

So, just a display precision issue – nothing to worry about. We limit the precision because otherwise it would be switching endlessly between (say) 44101.65 and 44101.66 and would be quite annoying, without actually telling us anything.