It's a bug. Any other system where you put in one input and expect a certain output and get something else it'd be called a bug. Making up new terms for AI doesn't help.
I actually disagree with bug for the same reason I disagree with hallucination: it creates the idea that there's an error in processing that needs to be fixed, rather than an inherent characteristic of the computing paradigm that needs to be managed.
To be accurate, a term would need to emphasize that it's describing an opinion about the output rather than something that happened inside the program. "Inaccuracies" would be one term that does that fairly well.
To be accurate, a term would need to emphasize that it's describing an opinion about the output rather than something that happened inside the program. "Inaccuracies" would be one term that does that fairly well.