Honestly, as far as I can see, it shouldn't be doing this. I can't find any settings to check or uncheck this as an option.
Mine isn't working that way - mail I read stays put until I tell it otherwise by placing a check and then choosing an action (save, delete, whatever).
Curious -- when you read an email, do you just click on it or do you place any sort of check in the box before reading?
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