Some VST user interfaces can be be displayed incorrectly in Reason/Suite/Intro/Lite 11.3.5 and later on macOS. This is one example of how it could look:
This happens because these VSTs are not compatible with the new version of Xcode, which was used to build Reason/Suite/Intro/Lite 11.3.5 and later for macOS.
The long-term solution is for the VST manufacturers to update their VSTs.
Meanwhile, a temporary solution would be to delete Reason/Suite/Intro/Lite and re-install version 11.3.4, here:
We're sorry for the inconvenience!