ADN4654 for isolating MIPI CSI-2

As mentioned in the last paragraph of page-20 of the Datasheet, ADN4654 can be used for isolating MIPI CSI-2.

I made a design like this. I found that when ADN4654 transmits high frequency HS-TX, the signal can be transmitted normally,

but when transmitting low frequency LP-TX, the signal cannot be transmitted normally.

Please refer to attached file. 

Excuse me, what is the possible cause of the problem?

Thanks & Regards

Denis