Nine Exhaust buff not working on Sereniel Cards

I've tried this multiple times now and I think Sereniel's Exhaust cards do not get buffed from Nine's exhaust card buff from neither her basic card, nor her other card which buffs Exhaust Card damage.

I'm not entirely sure if it works once her cards are used once to be "Exhaust" instead of "Exhaust 2", but either way I think it should work on both.

Edit: After some testing I found out that the buff from Slash only works on Nine herself, so the card description is wrong. It should say "Inceases damage amount of own Exhaust cards" instead of just "Inceases damage amount Exhaust cards".

The buff from her other card, "Experienced Strike" however works on all Exhaust cards and has the exact same phrasing.