Dynamic View 'Save' button is GREY

I have 2 dynamic views created for the client - same source sheets. However, upon changing the 'Workstream Group', the SS 1 photo's 'SAVE' button is greyed but in the SS 2 photo, it is not. I wonder what could be the issue. You might notice that the PIF No. is the same on both snips.

SS 1 Photo

SS 2 Photo

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