Form isn't shown on Facebook tab

I used Facebook tab method. It shows up on my page
( as "book here!" ) when using safari but is not there on the app although the form is still cut off on iPad.

Facebook does not support custom tabs on mobile and iPad.

You should use custom iframe app instead https://www.jotform.com/help/82-Adding-a-form-to-Facebook-Custom-iFrame-App-. You'll see the guide for mobile in the bottom section.

Let us know if you have more questions.