It sounds to me like the container mix may have crusted within
it and become a kind of solid chunk that water drains around
and down the sides of rather than through.
(I have had that happen occasionally with seedlings. I water
them, water runs out the bottom of a seedling pot, but then
testing with a moisture meter shows that only the top 1/4
inch and bottom 1/4 inch are moist. I saved them by switching
to bottom watering, allowing the crusty mix to soak up water
from the bottom of the pot.)
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