Why the new instance of strategy kills live orders, submitted with previous one?

[fx.practic]

Hello.

I the strategy opens position and submits protective orders.
I disable strategy, position and both orders are alive.
The strategy start behaviour WaitUntilFlat.
I enable the strategy and it cancels both orders, position still alive.

Why?

(On startup the strategy don't cancel manually submitted account orders)

[NinjaTrader_Jim]

Hello fx.practic,

Thanks for your post.

When you are using Wait Until Flat, you are telling NinjaTrader that you want the strategy to start from a flat position. The strategy will cancel open orders that were previously submitted by the strategy, and the strategy will wait until its virtual position (calculated from historical data) is closed out before it can submit a live order.

From the Help Guide:

When your strategy starts it will check for any active orders previously generated by the strategy on your account and cancel those first. Should the strategy be unable to cancel and receive confirmation on the cancellation of these orders within 40 seconds the strategy will not start and an alert will be issued.

https://ninjatrader.com/support/helpGuides/nt8/syncing_account_positions.htm

In addition to the start behaviors, it is important to understand the difference between strategy and account positions.

https://ninjatrader.com/support/helpGuides/nt8/strategy_position_vs_account_p.htm

We look forward to being of further assistance.

[fx.practic]

Shame on me.
I always thought that WaitUntilFlat is simple and clear thing and paid attention to more sophisticated on start behaviours.