Answer score on MSE different from score seen on MO profile

My answer to the question What is wrong with the sum of these two series? currently has a score of $39$. However, on my MathOverflow profile, it shows that it has a score of $40$ in the 'Top Network Posts' section. Any idea what's going on here?

• The same bug has been reported on Meta StackExchange and on Meta StackOverflow, neither of which have successfully found the source of the problem. – projectilemotion Dec 11 '17 at 19:12
• @projectilemotion : I'd have said "Neither has found" rather than "Neither have found." – Michael Hardy Dec 21 '17 at 5:07
• See shouldiblamecaching.com. Anyway, it seems to have updated by now; at least I see a score of 39 in both places. – Ilmari Karonen Jan 28 '18 at 5:14