8va doesn't work after 1st measure in playback

I've read through a few older posts where users had the same problem, but I have not been able to solve it yet. I created my project, put all of the notes in, and then added the 8va marking to each staff of the one voice that needed it. I first moved the bracket to the end of the staff by double-clicking and then dragging the handle to the end of the staff, and when it didn't work, I tried moving it by pressing Shift+right arrow key. I also tried saving the score, quitting Musescore, and restarting it. Still no luck; the playback only raises the pitch for the first measure, and then drops it back down to where it's written. Any ideas how to fix this?

Thanks!