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Is my SM7b defective?

Hello!

I recently got a Shure SM7b but I suspect it's defective. I've only recorded vocals for one song with it but felt there was something off with the sibilance so I analyzed it with Voxengo Span and noticed that there is a weird dip at 6500 Hz. It looks exactly like if there was an EQ with a very narrow bell with a pretty large decrease in dB at 6500 Hz.

This is an average measurement using Voxengo Span. The audio is completely dry, the SM7b set to flat (i.e. no bass roll off or presence boost).

sm7b spectrum