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You need to use the context parameter and a unique identifier in your nested list. Generally using entry_id is the easiest way to create a relationship between your two lists. Stash {entry_id} in your outer list (used for retrieval wit get_list) Set the context parameter in your nested list and feed it {entry_id} from your outer list when getting your ...

You have some keys which are repeated multiple times, video_url and video_title. The first duplicate video_url causes the problem, because it makes Stash 'think' the row of keys is starting again, i.e. a new row. This doubles up your list.

Stash itself doesn't have modifiers for variables, such as format="". It can only capture strings from other tags. You will need to save the formatted dates when you set the Stash list if you want to use them in a comparison when getting the list.