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If you settled all claims with these people, any and all claims should be barred, thereby preventing them from filing any new lawsuits. You will need to look at the settlement agreements and make sure they say that all claims are being settled in exchange for the monetary payment.
If the settlement agreement says this, you should file motions to dismiss these cases based on res judicata and the fact that you've settled these claims.
It sounds like they're trying to get two bites at the apple, which a court is not going to allow.