Hi,
We regret for the inconvenience caused. I was able to see the problem and logged a bug report in this regard. As I am unable to provide any workaround for this issue, we will try to fix this at the earliest and let you know.
Defect # 1366- Autoscroll makes XPTaskBarBoxes to scroll to top.
Please let us know if you have any questions. Thank you for using Syncfusion products.
Regards,
Mano