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Showing developer posts only. Show all posts in this thread.
Afaik this only happens if you move the start date forward and then backwards before starting. It's a nasty bug (and it causes other things too) but it should be avoidable if you just don't change the date backwards.
 
Hello

I would like to ask you to check if you are seeing the same thing appearing in 1.22.1 and if it is, please reply with a save where it has occured.