SCRAPPER - Fierce tiger strike bug?

it seems to me that Scrappers skill Fierce Tiger Strike is bugged. The last tripod “Rough Smash” says that you get +% attack power buff PER HIT for 3 sec and up to 5 times the percentage. The skill itself says it delivers 2 hits and I always get only the lowest buff for 1 hit. Can you look into it if that is a bug or am I missing something?