Could be that temps are slightly to high in the day time 30 c is pretty high for a seedling could be causing heat stress, maybe put lights onto 24/7 just for seedling stage and try and lower the temps maybe with more ventaltion. Im still new myself and im sure someone more experienced will come along and diagnose the problem for you.
BTW if your picture problem is probably the size or the format i also had the same problems, ill leave a link to a converter below that lets you choose the size of the picture and convert it into the right format.
Hops this helps
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