In photos 5 and 6, the white indentations appear to be critter bites which have sealed over. I suspect sow bug, snail or earwig damage. These may well be living in the potting mix. I would use a small amount of bait "suitable to their tastes" on the top of the mix to stop these.
The other photos are too small to determine the other problems but I think you have several different things going on here. I definitely agree with isolating these plants until you find the cause.
CL
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