You are right of course:
"0 = no hedging; automatically close all opposite positions with the same asset when a new position is opened."

But it looks like Zorro has not closed all opposite position but closed one position partially without updating the lot sizes internally.
Oanda lot sizes are in line with the trading activities, Zorro lot sizes are not. This affects 2 trades (181 and 186) where a trade in the opposite direction ha been triggered.
I have attached two screenhots to illustrate this.

As error 075 has been reported, something must be wrong, but I do not see what that could be.

Attached Files Trades Oanda.pngTrades Zorro.png