DisplayLink Manager version 1.8 is not the latest release as of today. The latest release is 1.10. I would suggest updating to the latest release and then testing the behavior again -->
https://www.synaptics.com/products/d...ownloads/macos
If that does not help, then I would suggest reporting the issue to DisplayLink directly by following the process outlined here -->
https://support.displaylink.com/know...to-displaylink