I’m not sure if this is by design. The catalog import will establish the specific folder(s) from the temporary catalog. If you then wish to copy from card I guess LR may treat this as intentional. Clearly the addition of the 2 suffix indicates some recognition; so it seems unexplainable other than the initial copying on earlier days was to a different catalog. I do use a travel catalog but for the entire trip, before combining with my master catalog.
Hi I am also thinking that it may be to do with the the way I imported to a temporary Catalog then imported this temp Cat to my main cat, and then when importing any images that where not imported in to the Temp Cat, that because the location has changed that it see's all images as new and tries to import all images again and add's a 2 suffix to some, what I can't understand is how the Duplicate option works, because clearly the images have the same name, date stamp and exif data, and the content has not changed, but it still imports these images...
My only option I can think of for now is to allow the imported to import all files again and as I know that duplicate file names will have a 2 suffix, is to do a custom filter to show only file with the suffix and mark these and delete them.
Can you not simply deselct all in the import dialog; and then use shift-click to selct just those items from the last days shoot?