модальное диалоговое окно пусто

мой модал не отображает мой вывод (пустой модал), кроме заголовка. Я проверил, и вывод работает, когда я не отображаю его в модальном.

что я могу изменить, чтобы отобразить вывод?

    <script>
$( function() {
$( "#mortgageResults" ).dialog({
autoOpen: false,
modal: false,
resizable: false,
autoResize: true,
show: {
effect: "clip",
duration: 400
},
hide: {
effect: "drop",
duration: 400
}
});

$( "#mortgagebtn" ).on( "click", function() {
$( "#mortgageResults" ).dialog( "open" );
return false;
});
} );
</script>

вычисление:

              <div id="calculator_one">
<?php
$borrow = $_POST['borrow']; //amount borrowed
$interest = $_POST['interest']; //interest rate
$term = $_POST['term']; //term
$months = ( $term * 12 );
$answer = ($borrow * ($interest / 100)) / 12;
$answer_two = ( $borrow * (($interest/12) / 100) / ( 1 - pow( 1 + (($interest/12) / 100), -$months)) ); ?>
<form id="calcualtor" action="" method="post" class="calculator">
<label class="calcAmount">Amount to borrow &#40;&#8369;&#41;</label>
<input class="calcAmount" type="text" name="borrow" maxlength="6" />
<br />
<label class="calcInterest">Interest &#40;&#37;&#41;</label>
<input class="calcInterest" type="text" name="interest" maxlength="4" />
<br />
<label class="calcTerm">Term &#40;Years&#41;</label>
<input class="calcTerm" type="text" name="term" maxlength="2" />
<br />
<button id="mortgagebtn" type="submit">Calculate</button>

</form>
</div>

мой вывод на дисплей:

      <div id="mortgageResults" title="Mortgage Results">
<?php
if (isset($_POST['mortgagebtn'])){
echo "<p class='calc_header'>Results</p>";
echo "<div id='results'><p class='calc_result'>Based on borrowing&nbsp;<span class='mortgage'>&#8369;", number_format($borrow) , "</span>&nbsp;over&nbsp;<span class='mortgage'>", ($term), "&nbsp;years</span>&nbsp;at&nbsp;<span class='mortgage'>", ($interest), "&#37;</span>, your monthly repayments would be&#58;</p>";
echo "<p class='calc_result'>Interest Only&nbsp;<span class='mortgage'>&#8369;", number_format($answer,2), "</span></p>";
echo "<p class='calc_result'>Repayment&nbsp;<span class='mortgage'>&#8369;", number_format($answer_two,2), "</span></p></div>";} ?>
</div>