Extraneous key signatures (and a notation query)

• Jan 15, 2022 - 17:06

I have accidentally 'broken' this score and ended up with extraneous key signatures which I can't delete. How can I get rid of them? Also, any idea what the highlighted comma symbol indicates? (They are present at various places in the score.)

Sancte.png

SancteDeus.mscz


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