Think I found the issue:
Maybe a wrong div generated by Wappler.
Having this:
<div id="popup1" class="popup">
<div class="view navbar-fixed">
<div class="pages navbar-through toolbar-through">
<div class="page">
<div class="navbar">
<div class="navbar-bg"></div>
<div class="navbar-inner">
<div class="center">Popup Title</div>
<div class="right"><a href="#" class="link popup-close">Done</a></div>
</div>
</div>
<div class="page-content">
<div class="block"></div>
</div>
</div>
</div>
</div>
</div>
We remove this line:
<div class="pages navbar-through toolbar-through"></div>
And it’s working:
<div id="popup1" class="popup">
<div class="view navbar-fixed">
<div class="page">
<div class="navbar">
<div class="navbar-bg"></div>
<div class="navbar-inner">
<div class="center">Popup Title</div>
<div class="right"><a href="#" class="link popup-close">Done</a></div>
</div>
</div>
<div class="page-content">
<div class="block"></div>
</div>
</div>
</div>
</div>