On the lip there's little "U" cutouts presumably for some sort of trim. I reckon they have made a weak point on the arch and allowed them to dent. Same thing in the exact same places has happened on the other side. Just a K10 thing I reckon. Gonna try to tap the dents back out.
Was well heated, rolled in stages with a proper tool. Mind you, was my first time rolling arches so that could have been one reason it happened.
Fortunately its not too bad. Can only really tell they aren't arch shaped from within about a meter of the arch.