3d Ground truth labelling job issue in bbox

Hi, I have created a 3d labelling job for 100 frames and got the job running. When I started annotating the objects with cuboid I am facing 2 issues,

1. The size of the bounding box for respective object is changing (increased or decreased) as I move to the next frames and drawing the bounding box (with increased or decreased size to the earlier frames). I believe this could be because of autofill functionality. Please confirm me whether I have an option to off the autofill functionality.
2. The bounding boxes are getting scattered or displaced each time I login and start working. If I annotate the objects for 10 frames, save it and logout for today, later when I login back the bounding boxes were scattered for couple of frames. Can you please let me know what could be done to reduce this issue.