Plasma Application themes not applying fully (progress bars)

Recently I’ve tried to use other application themes for Plasma, and aside from the default Breeze and Oxygen themes working perfectly fine, any other theme I try has progress bars broken, or at least they are broken in Dolphin, I haven’t checked any other applications yet, here are the progress bars working properly in both Breeze and Oxygen but Fusion and MS Windows 9x themes seem to use some kind of fallback Oxygen progress bars, as seen here (screenshot is Fusion theme)

Fusion

Any way to fix this? or is this something to do with my custom colour scheme that breakes it all?