Yeah but Only till a little tiny bit of run off, could underwatering be the problem ?
Underwatering could be the problem yes! But typically small & often wateringss at this stage are better that big ones once a week.
It's a good idea to pre water (at the correct pH) the pot before you drop your seed (like a day or so before) so there's plenty of moisture in there - then just little and often until the plant is about 30 cms tall (or day 20-25 if you got a good start) .
Hansbricks has some great coco grows and detailed journals - i'll try and find one for you!

Edit:
Here's all of Hans threads - looks like they're all coco.
https://www.autoflower.org/search/12943946/
and here's one just because i clicked on it and it had nice start photos. (they probably all have)
https://www.autoflower.org/threads/hans-autopot-grow-and-show-gorilla-glue-red-poison.55181/
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