HMC747

When I was using the HMC747 evaluation board, I found that as long as the D terminal of the HMC747 changes, the Q terminal changes immediately. There is no need to wait for the rising edge of the C terminal. I don't know what is going on?
My DP port is connected to a 1KHZ square wave, the high level is 3.3V, the low level is 2V, and the DN port is suspended.

My CP and CN ports are all left floating

I just did an experiment and found that if I apply a low level to the CP terminal, the changes in the data on the D terminal will not pass through to the Q terminal, but this seems to violate the description in the HMC747 datasheet: D terminal data is transmitted on the rising edge. According to my experiments, this seems to be a level trigger rather than an edge trigger.
In addition, I also found that the C terminal is low. If the two interfaces of my D terminal are both floating, the Q terminal is high; if the DP terminal is connected to the power supply, the Q terminal is low.
I am very confused about these experimental phenomena