Here's a screen shot that more accurately shows the result of what I am experiencing. Both of these images should look the same. The image on the left is a TIFF, as it appears in LR 5.7, after editing and before exporting. The image on the right is the same image, as it appears in LR, after exporting as a JPEG (quality=100, color space=sRGB). This also happens if exported as a TIFF (color space = ProPhoto RGB).
What is happening and how can I get this image properly exported out of Lightroom 5.7? I'm happy to upgrade to 6.0 (and maybe even move over to the leasing model) if that will fix the issue, but I'd first like to understand what is happening and why.
Thank you to whomever can spread some light on this issue.