I think its sharpest left side -minute swing- and focused only a few inches in front of the window trim
the photo on wall looks sharp but its the nearest to window edge that is sharpest and I don't think its as sharp as the nearest to window edge of the mirror
the mirror is maybe 2.5 inches in front of the trim
trying to shoot cobwebs probably off by 4in

I think you just missed focus at 5.6 ..and have some swing somewhere