It started working now. Thanks a lot for your help!
It got fixed somehow but I can not replicate this behavior on other domains. I am still facing the same issue of not able to generate print preview on other domains although I just migrated the above site to this site everything is working except for this.
https://www.lakefrontmarine.ca/product/2012-regal-52-sport-coupe/
Thank you very much for the quick response. But actually, I need something that can show checkboxes in the backend of the product view. So that when I am adding the product I can select these attributes quickly as I have a lot of them. So instead of typing I just select them to add to my product values
