the chain touching the inside of the cage when crossed large/large is normal. The chain comes from a range of angles depending on which rear sprocket it's coming from. Normally the FD is trimmed so the outer plate just clears when the chain is coming from the outermost rear sprocket to the large chainring. But when the chain comes from the extreme inside angle it'll rub on the inner plate.

Some systems have the ability to trim the FD over slightly so you can correct it as you ride. You might wonder why they don't just make the cage wider, and the answer is that it would make shifting sloppy, so they make it wide enough to clear the combinations you're expected to ride, and no more.