First thing to try is switch the WoWclient from DX11 to DX9, and restart the WoWclient.
If no joy...
go back to Honorbuddy-as-shipped, and see if the problem is repeatable. In your case, keep Enyo, but use Singular instead. Disable the streaming of all Buddy Store products except Enyo.
If still no joy...
you've a program that is interfering with proper Honorbuddy operation. These articles will help you work through the usual suspects: