Multilanguage component caused your problems. Perhaps you haven't set this up properly. Please translate page of Calculator properly and make sure multi-language component is compatible with jForms.
<div style="margin: 2px; padding: 0; width: 685px;"><script language="javascript" type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js"> </script><script language="javascript" type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.min.js"> </script><script type="text/javascript" src="http://www.mortgageloanplace.com/scripts/mortgage-calculator.pack.js"> </script><script type="text/javascript"> $(function() { $("#calculator_widget").MortgageCalculator({ mode: "normal", animate: "true", title: "", footer: "", intro: "With this calculator you can put in your values and estimate the amount of your loan and get an estimate on the amount of your monthly payments. Click on the 'Calculate' button when you're ready.", logo: {path: "", url: ""}, fields: { principal: { enabled: "null", type: "input", desc: "The total value of the loan (in dollars)"} , interest: { enabled: "null", type: "input", desc: "The annual interest rate of the loan"} , term: { enabled: "null", type: "select", desc: "The term of the loan (in years)"} , down: { enabled: "true", type: "input", desc: "The down payment on the loan (in dollars)"} , taxes: { enabled: "true", type: "input", desc: "The annual property taxes (in dollars)"} , insurance: { enabled: "true", type: "input", desc: "The annual homeowner's insurance (in dollars)"} , pmi: { enabled: "true", type: "input", desc: "The monthly private mortgage insurance (in dollars)"} , extra: { enabled: "true", type: "input", desc: "Extra to pay to the principal per month (in dollars)"} }, defaults: { taxes: 1.5, insurance: 0.5 }, bounds: { min: { principal: 0, interest: 0, term: 15 }, max: { principal: 15000000, interest: 15, term: 40 }, step: { term: 5} }, colors: { main: { text: "#000", back: "#eef2fd", border: "#39c" }, title: { text: "#39c", back: "" }, tab: { text: "#39c", back: "#fff", border: "#39c" }, pane: { text: "#000", back: "#fff", border: "#39c" }, input: { text: "#000", back: "#fff", border: "#aaa", error: "#fcc" }, button: { text: "#fff", back: "#46a026", border: "#1f731a" }, nav: { text: "#fff", back: "#39c", border: "#39c" }, table: { text: "#000", back: "#fff", border: "#aaa" }, footer: { text: "#999", back: "" }, link: { text: "#39c" }, values: { payment: "#6a9f35", taxes: "#0584af", insurance: "#ff9300", total: "#eee", principal: "#6a9f35", extra: "#90d948", interest: "#f00", balance: "#333"} }}); }); </script><div id="calculator_widget"></div><a href="http://www.mortgageloanplace.com/home.html" style="text-decoration: none; display: block; width: 100%; text-align: center; float: left; font-family: Verdana, san-serif; font-size:7pt; color: #3399CC;" target="_blank">Home Loan Calculator</a></div>
Please paste this code but DISABLE wysiwyg editor in Global Configuration before you doing that (or before you edit this page later).