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The soil is too moist. The incubator should be ventilated frequently, high humidity and sultry heat, it will be like this
I do multiple seedlings in a larger "Community" pot for germination, then transplant to larger individual pots. One reason is I usually get seeds from a fruit so have a good amoount at one time. Using a larger pot I think gives you more control over moisture. Seedling need far less water than you think, they have little leaf surface to lose water. Pulling them apart may seem brutal but if you wait till about 15cm they usualy don't stress much.