Title of question can change when it appears in “Related” list

Question

Here's an example. This question had some revisions to its title:

http://math.stackexchange.com/questions/1839/if-sum-n1-infty-fraca-nn2-is-finite-does-frac1n2-sum-i1n

http://math.stackexchange.com/posts/1839/revisions

but when cited in the list of Related questions here

http://math.stackexchange.com/questions/1766/if-sum-n1-infty-a-n3-converges-does-sum-n1-infty-fraca-n

it appears with the title from revision #2 (of 3). It's currently the second-to-last one on the list.

Answer 1

The question you mention now displays with the current title. Looks like the related questions database doesn't get updated every time a title is edited, but get synced up some time later.

Answer 2

The related question list is periodically refreshed as questions are read, so this is normal.