[Charlie Austin] ”
Why do you believe that?”
Because that level of incompetence can easily find a way to muck up anything in any NLE.
However, I didn’t know we were comparing 7 to X, so that is a difference. He could have setup his timeline as 60i because he didn’t know any better.
But even if the sequence is correct in X, all it takes is a Send to Compressor moment and rendering out as 60i, because the editor doesn’t know the difference, to add interlacing.