Accent makes note quieter when on a slurred staccato in Muse Keys

I was transcribing the first few measures of Schubert's Ave Maria, when I realized that if I put a slur and an accent on a staccato note, it actually makes it quieter for some reason. This only happens with the Muse Keys, barring the Harpsichord and Hammond Organ, which don't play accents at all (which is expected).
I'm sure this is an oversight , as I expected the exact opposite effect from that.