High humidity predisposes to rotting when air flow is not good, or plants are injured by bugs or scratches. Even with greenhouses, most of us in the US don't see more than 60%-70%. Much higher than this, various rots become more common.
I might add one photo shows a plant with two larger old leaves, and two small new leaves. This is often caused by high light. Reflected light in the tropics can be very bright. I live at 33 degrees north, and I can bloom Cattleyas in bright shade with only a couple hours of morning sun. However, bright light also makes many plants more resistant to rot.
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