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DP83640 Step adjustment cumulative effects vs value

Hello I want to clarify one moment regarding step adjustment mechanism.

What do I see when doing some experiments. I’m catching events from GPS pps (after GPS start and stabilization):

1)     Let’s say I’ve caught  FIRST pps event: ptp time is 1 s 0 ns

2)     I’m doing step up on value 1s 10000 ns

3)     On SECOND pps even ptp timer value is 3s 10000 ns – as expected

4)     I’m again doing step up on value 1s 10000 ns

5)     On THIRD pps even ptp timer value is 5s 10000 ns – interesting

It seems that for step adjustment seconds values are cumulative with previous but nanoseconds values are overwriting previous one – is it right?