I'm sorry, what do you mean no sound cues on night 5? If you mean the sound cues that play to indicate a monster attacking you, then no it's not normal. Did this glitch only happen on night 5?
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Can you tell me anything you did to cause this glitch.
Which version of the game are you playing?
Have you tried leaving the game and playing night 5 though the continue screen?
Did you check the music and sfx settings?
Did the sound work normally at first but only stopped playing after something like a jump scare happened?
I can't find anything that would have caused this glitch on my end.