this is a SWAG on my part, having designed systems for thirty years, but not this one.
the game was designed with certain output queues, like sound.
so, events occur during the play and sound files queue up to be played but because the player accelerated TC sound will not play again until TC retreats to whatever the sound threshold TC is.
so, you surface, give a course change, give a speed order, and then accelerate TC to 1024 in quick succession. not all of the sound files generated from your orders will have had sufficient time to play out, so they remain in the queue. when you drop out of warp-TC, the queue is then played out.
at least that is how i think it works.
it's not necessarily a bug...just an unintended feature.