I understand that, still the issue is unrelated to the plugin – the unwanted line break HTML code is not outputted by ajax search pro.
There is very like an extra line break character in the shortcode output in the newer release (as we changed and added new aria-labels), which is converted to the an actualy line break HTML character – and that should not happen whatsoever, nothing should ever change or temper shortcode outputs. In other words the plugin output code is altered by the container in which it is placed into, and that is the cause of the problem.
This also happens on the other site as well with the previous release, the difference is only a single line break, so the “push” is not apparent.
The best and quickest way to resolve this is to use the proper widget for the shortcode, so that it is considered as HTML instead of simple text – so it is not altered by the widget handler code.