"leak" on the underside of fridge freezer door?

I can't find a cause for water droplets appearing on the bottom of the freezer door on my fridge, which ends up on the top of the main door (situated below the freezer door). The rubber seal appears intact, there are no cold parts that show it's compromised. This is an old fridge, there has been the... show more I can't find a cause for water droplets appearing on the bottom of the freezer door on my fridge, which ends up on the top of the main door (situated below the freezer door).

The rubber seal appears intact, there are no cold parts that show it's compromised.

This is an old fridge, there has been the occasional defrost issue which has not appeared in over two years and does not affect the current area showing problems.
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