I have had this happening as well. I get messages about fame even when it is turned off globally in my save. It is really annoying. Usually turning it on and off again for the individual sim helps but it is annoying.
It's a bug I'm afraid. Seems pretty frequent. There were a couple of fame-related bugs introduced with the High School Years patch last summer and this is the one remaining...
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https://answers.ea.com/t5/Bug-Reports/OPEN-GF-Sims-gaining-fame-eventhough-they-are-out-of-the/td-p/11669939
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