I will look into this, it's some weird sCode glitch. I think it's supposed to be showing the birthday cake icon and it's just picking the wrong image (but resizing it like it would the bday cake)

The original issue has been fixed. (That is, the issue with the large minimod icon instead of the birthday cake)

I will look into the caching thing but that's sort of a separate issue.

[edit] We've decided the caching thing is minor enough that it's not worth fixing. Different forum posts are cached in different ways, but the cache should finish renewing across all of them within 25 minutes. I'm closing this thread since the primary issue was fixed.