The debugging environment of a project is reset every time visual studio is started

I have manually appended some paths to the environment in the project properties in Debugging->Environment to:
PATH=$(QTDIR)\bin;$(DIR_REMOTEADMIN_LIB_DEBUG);$(DIR_SIGNALVIEWER_LIB_DEBUG);$(PATH)

Every time I start visual studio, the add-in changes the environment back to : PATH="$(QTDIR)\bin%3b$(PATH)

If I remove the qt add-in, the environment stops getting changed.

This behavior is consistent for everybody on our software team.