There seem to be certain mechanic skills that I can't put points into. I've levelled Mechanic up to J13, and I have all of the prerequisite points in Mado Gear, Boost Knuckle, and Vulcan Arm; however when I try to put points into Flare Launcher, when I select apply and confirm that I want to put the points in, it just refunds the points without giving me an error message or any indication why.
Does anyone know what causes this issue or how to fix it? Thanks.