Are you using the latest version of Lightroom? What happens when you select a different image from the filmstrip when the navigator is stuck showing a different image.
Also, Optimize your Lightroom catalog from File>>Optiimize catalog and let us know if that helps.
This is a long-standing bug (many years). Adobe has said it will be fixed in the next release: Lightroom: Navigator preview pane shows wrong photo | Photoshop Family Customer Community .
Please add your me-too vote and details of your configuration to that bug report. Then you'll be notified when its status changes.
Thanks for your response. I have the latest version of CC, but it has been happening for generations of Lightroom. Does not happen every time but at least once overtime I am editing images.
Looks like a number of people have been experiencing this bug from the next comment. I have experienced across love PC and Mac versions of Lightroom and also normal versions before the moving to CC.
Just optimized my catalog as I had not done so for a while.
If you go into preferences and uncheck "Show Photos in navigator on mouse-over" it will eliminate the problem. This seems to have worked for me and many others. If they fix it in the next release it will be great.
4 Years to fix a bug . I guess I should be happy they are fixing bugs and there is hope they may fix the some of the multitude of other long standing bugs.
Lightroom CC2015.12/6.12 was released today and should address this issue. Please update your Lightroom to the latest version and let us know if you continue to see the issue. See Lightroom CC 2015.12 now available