I'm using a Recent Comments plugin by MtDewVirus that has worked perfectly since he released it. It displays in the sidebar - which is why I noticed this.
At some point in the last few days, the comment numbering has gone very very wrong.
In the sidebar, it is showing comments
In Manage > Comments, the last 5 comments are numbered
Somehow, the posts 7725-7722 are now numbered higher than newer posts so are being displayed first yet they relate to posts many months old. The display is easily sorted - I just remove the plugin - but the effect is very odd indeed. The comments still link correctly.
I've done nothing to the database.... any ideas ?