Settled Dell CC CO and score dropped 30 points. Due to reaging?

I just called in and settled an account that’s been delinquent since 2009 for 50%. It’s just been updated on my CR with $0 balance and shows status as Paid – Less than full balance. I thought this would raise my score, however, my score dropped 30 points.

 

Is this normal? Is this what I keep hearing about rebucketing?

 

Any assistance would be appreciated.