Hi,
Regarding the redundancy: the problem there is that those events are actually not the same event, but separate ones, or at least the post IDs are different, which makes any post type object unique.
However, it is possible to remove these ‘duplicates’ with a custom code. I have constrcuted a small custom snippet, that will check for duplicate titles and remove them before returning the results. Please note, that this may cause incorrect results counts in some cases, because of the item removals from the results list.
Try adding this custom code to the functions.php in your theme/child theme directory (copy from line 3 only!). Before editing, please make sure to have a full site back-up just in case!
I hope this helps!