What viewers are you using to see the images outside of Lightroom?
What are your export settings?
Links to before and after shots would be helpful so that we can see what you are seeing.
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Now that we can see what you see (bigger would have been better),
To get a better idea of what happened, we need:
a link to the original file (from something like DropBox or GoogleDrive),
what your edit settings were,
and what your export settings were.