Naotora 9KK/KK6KK issue

When the opponent's back is against a wall, 9KK/KK6KK, instead of hitting or being a +7~9 guard break, whiffs MOST of the times (90%), whether the opponents blocks or just stands doing nothing, leaving Naotora at -50 frames and back turned. This also makes her last kick of the string interruptible by random mashing.
Of course, this rarely occurs at max distance... but it still does.
Edit : Not exactly a glitch since it's related to a character's hurtbox.
This doesn't happen with characters like Bass and Raidou and maybe some other ones.