Thx every one.
Spoke to an Appliance Engineer, shared some photos as he had asked. He thinks the “backdoor “ between fridge and freezer is broken / jammed.
I doubled checked last night and this morning, if something is leaking from the compressor tank (liquid, right?). That may be trouble. That’s ok. As Dave and others said the black sealant has melted / is melting in the process.
I was thinking if the thermostat is faulty. He doesn’t think it is the cause. The freezing of food happens from top to bottom shelf of the fridge. Cold air comes thru’ the vent via the freezer.
@dfk41 - Trying to milk it as much as possible. Would replace if the attempt to fix fails. Haha.