photo 1 is the context,
photo 2 is a close-up from the side
photo 3 is a close-up from the top, although rotate your screen 270 degrees!
bolts appear to be out on cylinder 4, whereas 3 and 2 are inserted all the way home. Cylinder 1 (not shown) seems ok too.
No blowing or sounds - which suggests nothing wrong. Just not seen this on an exhaust manifold - not without some blowing !