Ok, this one's a bit tricky.
If Hyacinth's predictions work similar to Dusty Miller's, she would be predicting that x50 wins, followed by x100.
Kale on the other hand eliminates x50, x20 and x10 as winners, so that contradicts the previous prediction.
Nazuna marked x100, x20 and x30. Since x100 and x30 are not marked by Kale and x100 is marked by Hyacinth too, her prediction seems consistent. It doesn't help with deciding which of the previous predictions is correct though.
In the end it depends on which prediction is more trustworthy. If Hyacinth's, then x50 might win. If Kale's, then probably x30 since presumably x100 was marked by Hyacinth to get a lower score than x50. x100 is still a possibility though.
Only the results can show what are their predicting habits truthfully.