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I can see that you used the iFrame method to embed your form but the height doesn't seem to be enough to display the entire form. You can re-embed your form using the code below and this issue should be addressed.
<iframe id="JotFormIFrame" onload="window.parent.scrollTo(0,0)" allowtransparency="true" src="//form.jotform.us/form/50656420279154" frameborder="0" style="width:100%; height:1452px; border:none;" scrolling="no"></iframe>
Please let us know if further assistance is needed.
Where do I use the above code? Used it in tumblr and the form did not come up
First I would recommend you to get a fresh iFrame Code: https://www.jotform.com/help/148-Getting-the-Form-iFrame-Code
Before embedding it to Tumblr, paste the iFrame Code in a notepad like this, example:
And only copy the iFrame part, which will be the one that you will embed by going to your Tumblr dashboard, clicking the "Text" button.
Then, click first the "html" button, it should be highlighted in blue. After that, you can paste the code.
Let us know if you need more help, we will be glad to assist you.