I was about to post to say from the report it would be about (or at least) 2dKH and then I saw the video and that's a clear 2dKH. So your drop checker is out.
Are you using any additives in your tank such as pH adjusters?
ive only ever used easycarbo no ph adjusters, i will do a ph test now and post it
/www.aquaessentials.co.uk/ae-design-4-dkh-solution-250ml-p-1447.html). Aquarium water could be any value (it seems to be about 2dKH in your case), so yes I would redo it but you need a reference solution.