I reckon I know what's happened.
I jet the tanks before the run and I know the rio has to select tanks and then jet them.
I suspect jester doesn't then revert the selection back to previous which would be the snakeyes in this case. Needs testing to check but I suspect that's what's happened
il test it and get back to you, is my assesment above correct? if so its no bug, more an annoying quirk/sop lol