I am not sure if this is a bug or a feature, but I noticed that one crew in a taskforce currently undergoing TF training is only gaining 50% of the TF xp the other crews ars gaining. All crews are of the same quality and the CO is actually one of my best trainers.
Actually the CO is the S.O. of the taskforce as well, could this be the reason for the slower gain? But this seems unlikely since another taskforce undergoing training shows no major differences in xp gained among its crews.