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Your home lives on the 11th floor and the 10th floor living room ceiling, if there is a leak, it may be the cause of the water pipe, check and repair it.
See if the upstairs neighbors on the damp side have kitchens and bathrooms nearby – sometimes it's caused by leaks from the upstairs neighbors!
Moldy depends on what material you use, if it is aluminum-plastic panel, if it is moldy, it may be too dirty, and it is suitable for fungal growth when the moisture is heavy in spring, that is, the mold you see, it is generally easier to grow on the top of the kitchen.
It must be that the live wire and the zero line have touched together, that is, there is a short circuit, and there should be a large movement at this time, and at the same time, the leakage protector will trip, and it will snap. As for the smell of burning, it is probably caused by the burning of wires, and because it is a flame retardant material, it is not fully burned.
There is a leak upstairs - combine the actual situation and work with the upstairs neighbors to solve the leakage problem!
Generally speaking, it must have something to do with the upstairs. Because your ceiling won't leak blue stuff. But it's better to figure out what this blue thing is? I guess this blue thing may be the detergent in the toilet bowl.