StumbleUpon results missing if you directly download CSV file without searching first

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If I do a search in bookmarks then download the CSV, it gives me a load of StumbleUpon hits. If I just paste the URL to download the CSV direct, it misses out all the StumbleUpon hits. This also happens if you do the same for 'All' - do a search across all platforms then download the CSV and StumbleUpon is there, but if you just download the CSV by typing in the URL direct, without doing the search, StumbleUpon is missing.