Well, if you look at the graph I posted you can see how much response "droops" at the upper end - above 80 Hz. This is consistent with the crossover's attenuation. Your graph on the other hand, shows response at 100 Hz that's as high as it is at lower frequencies.
Of course, there could be perfectly good reasons for it. For instance, if you had the main speakers playing while the measurement was taken, that would account for it. We've also seen isolated incidents where a DIY subwoofer had such extreme output up high that the crossover couldn't effectively tame it, as well as a few situations where the receiver's crossover only functioned with digital signals and not analog.
But generally, when we see no upper end drop in response we start asking questions.
Regards,
Wayne