Dynamics not working in copy and pasted files

I've used Photoscore to read a PDF of my music. It read the music beautifully and it imported into muscore almost perfectly. The dynamics will not change no matter what I do. I'm using Musescore v4. I've tried changing the dynamics from the "dynamics" palette. I've gone into Properties > Playback > Notes and tried to reset the velocity but that doesn't help either. I've seen other people talk about "user velocity" in previous versions, but I cannot find that anywhere in v4. Usually, whenever I change the dynamics in the score, like changing from mf to f, the playback sounds that, but I cannot get it to work! Please help. I've attached the score form reference.