It actually happened across JNUG/JDST/DUST/NUGT... although JNUG was biggest $ amount by far. Looks like Direxion ETF hiccup and trades hitting tape late OR large fund repositioning in AH.
All significantly away from market price: DUST - $97K sold JDST - $8.6K sold NUGT - $16K bought JNUG - $6.19M bought