I am trying to embed into a site page on Sharepoint using the iFrame

I am trying to embed into a site page on Sharepoint using the iFrame code. It works fine on the Asset collection page, but when I attempt to insert it into the Site page, it accepts the code, but only displays a caption box. Please help. I am super frustrated.

Can you share us the link to the Site page here? That way we can check and recommend the next steps to fix the problem. But if it's the iframe, we usually recommend removing the script part of the embed codes. The script is auto adjusting the form height, especially if you are using PageBreak or Form Collapse in the form. 

See this screenshot:

Remove the codes in the yellow box, that is the script tags.