Hi,
thank you for your post.
First of all, you should not be using the triangles and trapezoids with infinity values. I understand what you intend to do, but you must use the Ramp term for such cases. If this does not solve your issue, please post the FLL code of the engine to run it through QtFuzzyLite. You can get the code by issuing FllExporter().toString(engine) or engine->toString().
Cheers.