I think I found some other bugs in the duplicate collection listing.
1) If there are more than 2 copies (for example 3), it will list only 2 copies in the duplicates output for some titles but not all. For example, in my collection I have three copies of "To Catch a Thief" and "Cliffhanger". It lists 3 copies for Cliffhanger but only 2 for To Catch a Thief. Same title and release as this was confirmed by going into "To Catch a Thief" and it says
EDIT- Never mind. Looks like there are two entries for this same disc in the database: To Catch a Thief (1955) [LV 6308]2) If you select the Duplicate list, and then switch to " Go HTML Only", and then then select a page number (or max), it will bump you back to the full collection list no matter what. So you have to stay in the non-HTML mode if you want to navigate pages on the Duplicates list.