It's intentional, Arcsys didn't want to change the typography to add both keyboard and controller prompts so they just did switching. It's like that for Blazblue too.
You can change the prompts in training mode to the attack prompts though.
Arcsys probably did that for the local players who used both a pad and keyboard.
But they still should've made space to add both.
You can change it to only using P, K, S, HS, D instead.
Oh dang, okay thanks guess I'll change it to the attack prompts.