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If I remember correctly, Musubi lost her sekirei mark when she momentarily died at the end of the first season. She gets revived only when Yume finally awakened within her body. Yume's number 8 sekirei mark has been on her navel ever since.
So yes, it is supposed to be there. In other words, that's still Musubi. She simply has lost her original sekirei mark some time ago.
The one thing I wonder about, is how come it's so big? Most sekirei possess a small one—even Akitsu's unique mark on her forehead isn't as large.
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