You know how you can put a straw into water
then put your finger over the end not submerged then lift? The water stays in the straw. Now just imagine your ear is the straw, and the complicated mess deeper inside your head is your finger. Normally you can lift your finger off and let it all leave the straw. You can’t do that as well with your ear canal. Plus, water tension really likes to keep that water in place when it is there, so even if you manage to take the ‘finger’ off, it still holds on to it’s surroundings, like a droplet on the side of the cup of water.
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