Thank you for the feedback. I am cleaning them with a swifter jet which
has a pad on the end of it and sprays out cleaner specifically for
hardwood floors and then wiping until they are dry.

I think the Swiffer is putting too much water on the flooring. I'd
throw it out. I have the same type and the manual says to only wipe the
floor with a lightly damp cloth. I have it in my bedroom and no
problems now for 4 months.

~Melanie