Thalia’s voice changing…

On Under Pressure, its stuttery, and then there’s an upgrade where she sounds clear on TITS

But on Everybody and YSIV whilst they’re walking the planet she sounds stuttery again. And on No Pressure she sounds stuttery. Some have said this could be his 2nd album (which I disagree with, but I’m not getting into here), but that still wouldn’t explain the stutter on the other 2 post-TITS album skits

So does anybody know why this is? Have I missed or forgotten something