Underside of the decking is solid, just a bad picture. Had to have some mold remediation done when we bought the place, so some remnants of that.Those air baffles look fairly narrow. Your truss spacing is 24", correct?
Is the underside of your decking shaggy and de-laminating or is that an optical illusion of the picture?
Is that yellow insulation tucked around the baffles OK? Should the soffit vents be open?