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Not saying that it could not happen it just, I have not seen
It possible that you have some leakage from the attic around
the return pleum.Hot humid air hitting a cold metal surface.Thats possible.
Other then not really knowing where your system is install
and how well its performing all we can do is guest at best
at what the problem could be.
Maybe a pro with good testing equipment and psychrometric
chart could point you in the right direction.