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I checked your form and try to embed it with "Lightbox". The problem in this scenario is your form Title has apostrophe " ' " (Wednesday's Special). If you replace it with "space" (Wednesday s Special) , your "Lightbox" is works without any problem.
Also, we are going to fix this problem with "Lightbox". Meanwhile, you need to use "Lightbox" in this way.
For further assistance, please don't hesitate to contact us.
Thanks for your understanding.
The good news has came from developers just now. You can add your title with apostrophe " ' ", if you want to. The method from the previous thread is not necessary right now.
Have a nice day.