More Clarification on VTOL Tuning

Hi All,
I was working on my quadplane tuning who has a weight of 15 kg. During flight, Visually it is showing everything fine but in the log it was showing that the att.roll and att.desroll are not very close to each other. Could anyone tell me is this thing acceptable .

I am also attaching the log.
Log Link: 00000021 Qloiter-Roll Pitch Yaw Responses.BIN - Google Drive