Since Scroll Viewport has to work around a few limitations with links, which is why an anchor always includes a href-attribute.
Because the UI-Expand is working with those anchors, Scroll Viewport is reloading the page if clicking on the macro.
You can fix this problem by removing the href-attribute of the class rwui_expand via jQuery:
Removing href-attribute from .rwui_expand
<script> $('.rwui_expand').removeAttr('href') </script>
It is the best for adding this script before the closing tag of the body.