*Looks up quest* Um... the quest where you set out the banquet like a waiter? Yeah, you have nothing to worry about. Paranoia be gone! And think positive, if its just a graphical glitch its possible it wont happen again when you do the quest, so you might be pre-worrying for nothing over a glitch that wont even happen.

Just want to make sure it is okay to do a quest with known bugs provided you are not gaining any advantage from them.
It is perfectly ok. The key is right there in your own text, "you are not gaining any advantage".