My Z3 instance is short on XAG/USD. For the last few days, it has constantly lowered the Stop by about 0.01 per BarPeriod to 22.30 at last.
However, in the most recent BarPeriod, the Stop has been trailed to 22.51, so the the Stop ditance has been increased.
Is this WAI?

Stops can move in both directions.

The Z1, Z2, and Z3 systems limit the duration of some trades by tightening the stop. This is the constantly lowering that you observed. It is not really trailing, as it can also happen when the price does not move.

When the entry condition is fulfilled again while trades of the same algorithm are still open, their duration is reset and their stop is set to the optimal value at the current price. This can move the stop both upwards or downwards.

Thanks for the insights!! Does the same thing apply to Z12?

Yes.

Ok, thanks for the explanation. Unfortunately, the trade has been stopped at 22.50