Lightroom: Problem exporting photos with presets/crop adjustments. Will not retain presets...Why?

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I'm using Lightroom 3 version 3.6. I made all my cropping adjustments, exposure, sharpening and noise reduction adjustments. Also added LR presents like sepia tone, black and white, bleach bypass. on several of my photo's. Then I selected all photos, clicked on export button, and saved them in a folder on desktop. All of the LR presents are visible in LR and they look great. However, when I open the saved folder on my desktop....all the photos are not edited. None of the presets or crops took. What is going on? Problem started a few days ago.