Moving replies add-on has been updated today and now provides a fixed version of a wrong link redirection to the moved post in a topic, which appears to be the last on the 2nd, 3rd or greater page. In this case, earlier version of the add-on provided the wrong redirection to a +1 page, which could result in caching such redirection in some browsers (Firefox, Chrome) and later provide an impression like the proper page can't be opened and always redirected to the earlier page until the browser's cache is cleaned.
The file to update is
addon_movepost2.php. Enjoy.