when you enter the command - /setblock (position 1 level Big dripleaf) minecraft:big_dripleaf
I don't know how to say it's a mistake or not.
everything is in the picture
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Please provide the exact commands used.

i added a video

Big dripleafs turn themselves into big dripleaf stems when another is right above them. You did not providea facing state, so it is the default value, which is not the same value as you placed.
Duplicate of MC-31100.