Yuumi W Bug giving incorrect values.

The situation:

1. Jhin has 206 AD.
2. My Yuumi has 72 AP.
3. Level 3 You and Me!, which gives "9 Adaptive + 10% of stats"
4. Attach to Jhin

Expected result: Jhin now has 206 + 9 + 7.2 = 225.2 AD

Actual result: Jhin has 206 + 7.2 = 213.2 AD

The tooltip for Change of Plan! also indicates it's only 10% of stats instead of the flat adaptive.

So either the YOu and Me! tooltip is wrong or the effect is wrong.