Violin 1 Attacks Too Harshly Especially When Playing at Slow Tempos

Hi.

I attached a score of the solo violin playing a slow melody in its lower register at mp. However, the violin 1 solo MuseSounds plays back too harshly on the attack. When I switch it to violin 2 solo, the problem resolves, and the playback is actually much clearer than the violin 1 solo.

Is this a bug?

Attached is the score. Thanks.