This isn't a bug... but I remember it differently from a long time ago on the PC ver
***SPOILERS****
When I first talk to the Yehat, I could read the entire story and back history of the queen breaking the aliance with the alience of free stars... and how they betrayed the shoffixi. It created a lot more build up to the Yehats dishonor when you bring the shofixi back to them.
Seems you can't read there back history until you have returned the shofixi to them, and it's no longer as meaningful.
But I gotta say... I LOVE THE VOICE OVER for the Yehat
"You boldly enter our space! Approach this Dreadnought as though it were a recreation base and then play the dumb hominid? Who do you take us for, Captain... Spathi!?"