(Reissuing @Caphleo's report since this update came 5 months ago and our client is now 5 months old. So hopefully it supports).
What did you EXACTLY do 1 minute before you saw this bug?(you went open your freezer? that counts. yea that's what exactly means): Not really a bug per se, but an update on kro.
Describe the bug as much as possible:
Critical hits are now applied to skills such as Double Attack, Fear Breeze, Chain Action, etc (any skill that will make you hit multiple hits per attack). So each of those hits also has a chance to crit.
Give your source (why you think it's bug, according which website?):
Have you tested?: Not yet implemented here, so we still follow the old critical mechanics. But this is a new mechanic that kro has already implemented.