Redirect Is Broken (sometimes)

I have a form located here:

http://buildingfinancials.co/eforms/bookkeeping-pricing-estimator-ac/12/

(Here is result URL: http://buildingfinancials.co/wp-admin/admin-ajax.php?id=j6Yt54eESB%2Bn7Ug6K%2FQCWzol2S%2BruJpN%2FyiZ9IlYw4A%3D) — Screenshot attached

And about 25% of the time, the redirect seems to break and just shows a ‘zero’ on the screen?  It works sometimes and not others (obviously not desirable

Seems to be consistent with ‘4’ for accounts and ’80’ on transactions – higher input works.

Any help is appreciated!!