BLUE TONGUE SKINKS

Anytime my northern blue tongue skink (9 months old), drops a sperm plug, he makes this weird shrieking noise. Is this normal or is there any way I could fix it?
I’m open to going to see a vet but don’t want to waste my money and time if it’s nothing to worry about or something as easy as say fixing the humidity.

I have a few that do that also. I coudn't stop laughing the first time I heard a skink fart.