I cannot remember the last time I conceded or scored from a double corner and I have never conceded to my know large straight after a sub.

The double corner does not have to be fixed it's not a fault. The engine decides you are going to score so you score the commentary is just to add effect. So weather or not it says you scored from a corner, even if it didn't you would still score at that time but just with different commentary. If that makes sense.

As for the sub issue. Maybe your just making bad subs