Thanks for your post.
Your case is a perfect example for which QtFuzzyLite will help you determine what is wrong in your engine.
Please, download QtFuzzyLite, import your file, and you will solve your problem, whatever it is. You can either buy a license of QtFuzzyLite or use the Community version for free.
If your problem persists, please post again using the FLL code for your engine, which you can extract using