Clenched fist research reduces Carolean melee?

So, I came across this couple days ago. I think its a misprint more than a bug but It makes it look like this upgrade weakens caroleans.

https://preview.redd.it/vt16brbh6k271.png?width=572&format=png&auto=webp&s=e0695b3ad5fb969c9a39e909b58a4f3c8882a38d