LIGHTROOM: Unwanted Photo Deletion

I have an issue where Lightroom tries to delete photos from the library when I haven't asked it to. This issue doesn't always happen, but when it does it is usually after I've been working in Lightroom for a longer period of time. An example: I finish editing a photo and press L to dim the lights. When I'm done I press L again to cycle back to lights on mode. At this point I hear the error sound and a message pops up confirming that I wish to delete the photo. At no point did I press the delete key and ask for the photo to be deleted! This happens in other situations too, such as when using the I key to cycle through image info when viewing an image in the library.

I am running Lightroom 4.1 on Mac OS X Mountain Lion (all software up to date). This issue has occurred on previous versions of Mac OS X and previous versions of Lightroom.