I have some questions since when you can't create deb packages.
After a reinstall or from the beginning?


Please have a look at these files..., do they make sense?:
You can try to hardcode your sysroot...and see what you get

QTSDK/MADDE/madlib/ma-create-target.sh
QTSDK/MADDE/madlib/ma-cmd/xdpkg
QTSDK/MADDE/madbin/dpkg

Interesting to read...
QTSDK/MADDE/docs/DPKGToolsForMADDE.html

However I can't explain why you get somewhere multiple sysroot pathes after a reinstallation.