kspace after ipat seems strange

<img width="1250" height="1085" alt="Image" src="https://github.com/user-attachments/assets/5c73aa01-d1ee-477b-945b-76d5c48af2b3" />

Hello,

I noticed on the k space that there is a difference in intensity between the lines truly acquired and the lines filled with Grappa.
I'm using the mdgrappa function for 3D images.

Do you have any idea where the problem might be coming from? 
Thanks!