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Not sure what happened, but 8/31 is missing from my calendar...
The thing is that the 1st of August wasn't Sunday like your calendar shows.Try settigs-apps-all-calendar,force stop and clear data.
Well, not sure why is that either, I am currently travelling to another timezone, let me check again when I return home.
Keep us updated.
Back to my timezone , and the issue is gone...
Strange,don't know what could have been.
It is a really strange problem.