https://www.zorro-trader.com/manual/en/trading.htm

If the close command repeatedly fails because the trade is unknown to the broker, Zorro will assume that it was already closed, stop the close attempts, and remove it from its internal trade list.


How often is "repeatedly"?

Repeatedly in psychological terms, can't be counted, but it feels like it was often.
Repeatedly in mathematical terms, 25 times, once per Bar.

I don't know, but I'll inquire and will update the manual.