Just an update.
It appears that the double listing in the library of specific age ratings is caused by having one or more movies duplicated in different shares. I spent a bit of time running through the possible combinations and found that just having movies on multiple shares is not an issue. The duplicate rating happens when you have even one duplicate out of hundreds on different shares. If you have duplicates of a movie that’s rated PG then you’ll have PG listed twice in the library movie sort by age rating. If you have duplicates that are rated PG-13 then PG-13 will be listed twice and so on. As soon as you remove either of the duplicates and let the library finish the updating the age rating in library for that movie will no longer be listed twice. You do have to remove ALL duplicates that share the same age rating in order to get the library to show that age rating only once.
If you have several hundred in different shares it could be tedious to find the duplicates but if you select that age rating in the library you can scroll through and it will show two entries for the movies that are duplicated so that makes it a bit easier.
It’s defiantly a bug but not a major one.
The reason for my duplicates is that I have some movies “backed up” to multiple drives on different systems just in case one goes south I can still have a little entertainment till the repairs are complete.
James, if I can help clarify this convoluted rambling in any way let me know.