I've been having a recurring issue in Lightroom CC on my Macbook that has persisted through various updates (now on 4.1)
There is a discrepancy between the image displayed in the preview box when viewed in Grid Mode and Film Strip, but when the photo is viewed in detail it shows something entirely different. The metadata associated with the photo is the same as the image in the preview box. This issue only occurs on my MacBook and not on my synced mobile Lightroom App.
I believe this issue started when I moved my originals from the internal SSD to an external drive, some I'm sure the inception of the problem is rooted in this move. Any advice on how to solve this would be appreciated!