Turns out there was no 896th post. I mean, there WAS, but I didn't call it that.
That, with the duplicate post 1083, more-or-less corrected itself.
Except that the summary still tells me that I only have 1186 posts, but if I list all of the posts, it says I have 1188. Is there perhaps a bug in blogger somewhere?
A bit more digging is required.