This is really nasty.
I'm playing chords, 2 semitones down, 100% mix.
It behaves as though Firehawk (FX, v 1.20) is trying to "track" the notes played, like the intelligent bender does but that is completely unnecessary. It should be trivial in such a powerful processor to simply pitch shift the whole signal. I suspect there is a mistake in the program. I think there is also some latency, which supports the idea that it is trying to track before making a sound. I have switched off all other effects (except amp/cab) but it still happens. It seems to get worse as the level dies away, again suggesting that it tries to track.
Line6 - please fix.