You are correct, Elle.
Usually, when I have completed the crossword on my iPad, it then gives me a 'time taken', if I have everything correct. If I haven't, it asks me if I want to see the errors, which I normally do.
On this occasion, my errors were given as 7D and 20D, with the 'apparent' correct answers which I gave in my original post.
All I am trying to do is allay my fears that I am being taken down a dark alley!