One voice louder than the rest

A tab I’m working on is playing the fourth voice far louder than the rest of them. All voices are at the same level in the mix panel. Until today it’s worked fine. Here’s a link to it, but currently the link doesn’t work because of this issue. If you have some other way of going into my public tabs, it’s the one titled “polyphony copy”.

I’ve been having a lot of issues with this tab, maybe because of the new update, or because it has more notes than Hookpad can easily handle.