Yuumi W not granting the correct amount of adaptive force

I was watching BunnyFuFuu's video on full ap Yuumi and after he had 922 ap he hovered over his lvl5 w (which should grant 21% of her ap/ad as adative force) and I saw that it said that it granted only 117 adaptive force https://cdn.discordapp.com/attachments/570706260274577458/573486071220928512/Screenshot_20190502-142643_YouTube.jpg I thought "No way that 21% from 922 is 117" so I went to calculate and it shoved this https://cdn.discordapp.com/attachments/570706260274577458/573486071220928513/Screenshot_20190502-142712_Calculator.jpg Now I don't know if it's intended to be like this but to me it seems wrong
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