Staying busy part 3: blog troubleshooting

I am finding that just maintaining a blog can keep you busy, and I don’t mean the writing part. I discovered that some older comments from before I moved the blog to this new address are not appearing correctly or at all. I spent more time than I’d like yesterday trying to troubleshoot the problem. All I have found so far is that it only seems to happen with this particular theme selected. If I switch the look to the default WP theme, for example, the comments appear in the correct posts. How can that happen? If anyone has a clue, please let me know. Are there known issues with the “black hat” theme?