Not a glitch. itunes doesn't charge different prices for HD and UHD. Unlike Vudu

Uhhh...

This same title is $9.99 in SD, HD, and UHD on VUDU: http://i.imgur.com/5BO6aYN.png

Microsoft Movies has it "on 50% off sale" for $10: https://www.microsoft.com/en-us/p/west-side-story-2021-bonus/8D6KGWXNCP3F/0003?activetab=pivot%3aoverviewtab

Amazon has it for $10 in HD only: https://www.amazon.com/West-Side-Story-Bonus-Features/dp/B09QFZX8Q2

Google Play lists it at $20: https://play.google.com/store/movies/details/West_Side_Story?id=QnCYTDLiMi0.P

So perhaps not a "glitch" but half the price of all the other major digital storefronts.

And for the record, just like iTunes, VUDU is NOT charing different prices for HD and UHD.