Note how it says "last reply by ShadowFlare."

Mine was the last post.

Does it only tell you the last poster/post date correctly if it was someone other than you? I don't think so, because I seem to remember seeing "Last post by Pronogo" several times.
EDIT:
See?
There are code breaks and bugs like these. I believe we found this one a few months back.
None.

PyMS and ProTRG developer
The "last poster" cache is not updated when a post is deleted (im assuming).
The "last poster" cache is not updated when a post is deleted (im assuming).
I've deleted posts and this hadn't occured.

I do stuff and thingies... Try widening and reducing the number of small nooks and crannies to correct the problem.
I had the same after I posted something in map making assistance ~2 weeks ago.
Alright, I just wanted to know if it was something regular or not. Thanks!