[kdenlive] Kdenlive uses the Breeze theme exclusively

[SanskritFritz]

On my system, Kdenlive insists on using the Breeze theme exclusively, no
other program does that. I have set the Qtcurve theme system wide, all
applications obey that except Kdenlive. Even

kdenlive -style qtcurve

doesnt work, still the Breeze theme is used.
How can I troubleshoot this?
I'm on Archlinux, latest kernel, etc. Kdenlive version 15.12.2. Using: KDE
Frameworks 5.19.0 Qt 5.5.1
Here is the output when started from the terminal:
https://gist.github.com/anonymous/ae5f1b54048f35771420
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