As you can see, the entire progress bar in confined to the lower left corner, but it still works. Randomly tapping in the space it is supposed to be occupying skips the song to the selected time-stamp. But the progress bar stays in that same truncated/shortened form.
Steps I have already taken in attempt to resolve the problem: clearing Poweramp's app data, reinstalling the app and the unlocker
Device: Sony Xperia Z5 Compact
Android version: 6.0.1
Stock Sony firmware, not rooted.
Edit: sorry for wasting everyone's time, it appears the theme itself is broken, as the progress bar works fine with the stock theme.