Why does my form disappear in preview or when viewing online?

I have other forms that are not doing this. Any idea what's going on?

Thank you for contacting us.

The form is hidden for some reason. In order to fix this, please add the following CSS to your form via the Form Designer.

form {
display: block !important;
}

If you need any further assistance, please let us know.

Thank you as the form appears now, however, now it's added some extra non-functional back" and "next" buttons on each page of the preview and it's taking the last field sections and messing up the end. Please help!

UPDATE: I fixed this by deleting the offending field section and putting a fresh field in. Something must've corrupted that section in the html or something. Anyway, thanks for all the help! You guys are great!

Yes, it appears so. Thanks!