Some folks have experienced this issue with ProTools as well.
https://forum.waves.com/t/plug-ins-gui-upside-down/2148
What version are you are you running?? Is it officially supported yet??
https://www.waves.com/support/tech-specs/supported-hosts#version-12
I know that there has been some “blank UI” issues, but thats generally a result of the graphics card no longer supporting the most recent version of Apple’s Metal. That doesnt seem to be the case here, though.