Displaying measurements

Hi
I just started to figure out REW and this is what I encountered. I conduct basic measurements, without any calibration or bass management. That is, like Audyssey does it only with the help of REW. I get these graphs in the bass part:


Then I run the Audyssey calibration, upload it to the receiver and conduct repeated measurements of the system and get:


And here's the question!

Considering that the crossovers are set 80Hz to 90Hz, respectively, why do I have data in the measurements for 40Hz, 30Hz and even 20Hz at a linear volume of 75dB?

Despite the fact that the settings of REW itself do not change between measurements before and after calibration!

Maybe something is wrong with the display of graphs?

Use REW version x64_5_40_beta_72.
I tried to do calibration using the A1 Evo Neuron script, the same thing, slightly different levels, but the result is generally the same!

Looks like the sub is active in the calibrated measurements. You could disconnect it.

Yes, of course it is active!
The same thing happened with un-oscillated measurements. In fact, the only difference is that: volume adjustment is set to 0, delays are also set by default, and the acoustics type is set to "large".
I just wanted to see how the crossovers on the receiver work.
From the sound point of view, I hear that when the crossovers are changed, the sound also changes, at certain moments it starts to go not through the speakers, but to the subwoofer. I just wanted to see it on the graphs.