Hi Son,
I testes the counter top wizard on my side and I was able to produce the cut out for the sink. I tried to make my design resemble yours so I used a SB33 with the 33″ Kohler 1-1/2 Tub Sink #2 and when I used the Counter top Wizard, it saw the sink. See the attached image.
It is possible that this is an issue in your particular design so the first thing i would suggest is to copy/paste your design unto a new floor plan and then test it out. If it doesn’t work after that then perhaps you can try running basic maintenance on the program ( this is remove any preferences you set up and reset the registries of the program back to their default settings). Click HERE to read an article to help you with the basic maintenance. If this doesn’t work then i would definitely suggest to give our support team a call at 1.866.697.2020.
Regards,
Kris