[Freesurfer] QDEC and ROI drawing

Dear Freesurfer's experts, I draw a specific region on fsaverage using QDEC, then I mapped this label on each subject using mri_label2label. I looked at these registered labels using freeview. Most of them are perfect but for some of them I would like to correct the segmentation. I would like to modify it using QDEC but when I overlay this label on the surface of my subject it has been shifted. I think this shift is because QDEC is using fsaverage as the standard space. I try opening QDEC using the "average" option and use the subject I want but I still get this shift. am I missing something ? Thank you in advance for your help. Arnaud Bore