"Typically TVIX and UVXY follow each other perfectly and they both have 2X the gain or loss of VXX. But, today TVIX only dropped -3% while UVXY dropped -6% and VXX dropped -3%.
Why is TVIX broken today and not tracking UVXY and the future options like it should?"
No, Greg, TVIX and UVXY never track each other perfectly because TVIX trades at a fluctuating premium and UVXY trades at par to intrinsic value/nav.
You would be absolutely correct to state that the day to day, minute to minute, percentage changes of TVIX and UVXY intrinsic values correlate exactly and are 2X the percentage change of ^VXX-IV as well.
TVIX appears to be "broken" because its premium has suddenly jumped from 2% to 6-7%.