Ok. This is apparently an issue with the MT4 server setup of that broker. For a workaround, edit your z.ini file and set BrokerPatch = 3. Then Zorro will calculate the profits. This will produce more correct values, but they will still not 100% match the MT4 results. But it is not harmful to the strategy.

We would like to look closer into that matter. Does it only happen with a real account, or also with a demo account? Do you get error 015 with trades of any asset, or only with some assets?