Popup not working within jquerymobile - jquery-mobile

Question

I'm a touch lost - I have taken a popup example from the jquery demo page as a template...
If I put my popup within the first page, it works - I can call it from within js script to open.
Thus... the following does work
<div data-role="page" class="page" id="Menu">
<div data-role="header" data-position="fixed" class="ui-title center">
<div data-role="controlgroup" data-type="horizontal">
<span class='htitle'>Barserver.com</span>
</div>
</div>
<div id="MainContent">
<div id="MenuList"></div>
</div>
<div data-role="popup" id="popup" data-overlay-theme="b" data-theme="b" data-dismissible="false" style="max-width:400px;">
<div data-role="header" data-theme="a">
<h1>Delete Page?</h1>
</div>
<div role="main" class="ui-content">
<h3 class="ui-title">Are you sure you want to delete this page?</h3>
<p>This action cannot be undone.</p>
Cancel
Delete
</div>
</div>
I can dynamically open it via
$("#popup").popup("open");
However if I move the popup to another (data-role) page within the same document, it does not get displayed, nor errors in console.log. Can anyone steer me forward? The following does NOT work...
<div data-role="page" class="page" id="OrderList">
<div data-role="header" data-position="fixed" class="ui-title text-center">
<div data-role="controlgroup" data-type="horizontal">
<span class='htitle'>Barserver.com</span>
</div>
</div>
<div id="OrderListContent" class="productdhtml ui-content"></div>
<div data-role="popup" id="popup" data-overlay-theme="b" data-theme="b" data-dismissible="false" style="max-width:400px;">
<div data-role="header" data-theme="a">
<h1>Delete Page?</h1>
</div>
<div role="main" class="ui-content">
<h3 class="ui-title">Are you sure you want to delete this page?</h3>
<p>This action cannot be undone.</p>
Cancel
Delete
</div>
</div>
</div>
To avoid misunderstanding - the first code sample works, the second one does not work (meaning no errors, no modal like dialog box gets displayed).
Why?
(All help appreciated of course)

Answer 1

I got it (thanks to #Omar for direction). A coded answer is not easy but I will try draft and share in a few days (I'm behind on my work because of trying to fix this problem).
For the purpose of this note, when I say "this failed" I mean "no popup, no change in address bar, no console error."
I have a form. If operator attempted to navigate away, a test should be done to confirm all data was entered. All my a-href tags had page references, and jquery gives precedence to a-href tags over any other events I had applied. I had not considered the ramifications of this. The result? Form displayed, incompletely filled, operator selects to navigate elsewhere, popup call starts/ends but "failed" and jquery quickly navigates to the page named in the a-href page.
Solution:
When using popups, do not name pages in a-href tags. Thus, when using popups, avoid
<a href='#Page5'>Page 5</a>
and instead
<a href='#' id='page5'>Page 5</a>
and create an event that decides if a popup should be displayed, or if not, that page5 should be navigated to.
I hope that makes sense.