The AGM-114K is a laser-guided missile, it has no FLIR camera on the missile and can only receive guidance through it's on board laser reflector sensor that guides it to a painted target. Despite this, in game this missile is capable of locking onto targets spotted using an aircraft's FLIR sensor. To remedy this the irLock value should be set to 0.
AGM-114K missile exposed through a transparent casing, showing the laser homing guidance system in front, copper cone explosively formed penetrator (EFP) shaped explosive charge in the middle, and propulsion in rear.
Sources: https://en.wikipedia.org/wiki/AGM-114_Hellfire , https://asc.army.mil/web/portfolio-item/hellfire-family-of-missiles/ , https://www.globalsecurity.org/military/systems/munitions/agm-114k.htm , https://www.army-technology.com/projects/hellfire-ii-missile/ , and https://weaponsystems.net/weaponsystem/HH08%20-%20AGM-114%20Hellfire.html