Eh, just what stories were deleted, something along those lines. As the highlighting changes afterwards, or even during, I am always paranoid that I am deleting something I want to keep.
But, no, it's not crazy. I had it happen to me more often that I care to. In fact, just last week I ran into a story that sort of sounded familiar, in an unpleasant sort of way, but it could have been just that I thought the story had a potential of being bad despite a nice summary.
Speaking of logging, I noticed that now Calibre writes all the chapters that are being downloaded, making the job logs rather extensive. Is it meant to do that, or just a bug?