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They are both updated at the same time, but for a long time I had very aggressive caching on to keep within the free tier. Because App Engine Memcache can be cleared without warning, this meant that often one bot would lose a battle before it could be written to disk, but not the other. Ironically, this is one of those situations where a higher client load on the server means that less data gets lost, since the bot was more likely to hit the 'write threshold' before being evicted from the cache. Now that I have more writes to play with, I've lowered the write caching thresholds a lot, and we should eventually see everything settling down.