Yes, PI resolves the times but the times passed to PI are resolved to a PI subsecond, which is 1/65536 of one second. See this link for further description.
Focusing in on just the decimal portion of your times,
0.0600000 * 65536 would be 3932.16, but PI requires it to be a whole number, so its rounded up to 3933.
0.0600128 * 65536 would be 3,932.9988608 but PI rounds it up to 3933, which is the same as your start time.
Then 3933 / 65536 becomes 0.0600128173828125, which is the PI subsecond slice used by both start and end times.
Note the AFTime has a .ToPIPrecision() method that would show you what PI adjusts your requested times to.