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This is most likely due to the last activity date getting updated to current. This is the main reason to never dispute something that is valid. I’ve done it and suffered and have heard of similar things happening to others. I doubt you will get those points back when it closes. You probably should do some good will letters and see if you can get it removed or at least some of the derogatory factors off the account.
if you search for the company and goodwill then you may find some threads others have started and any results they may have had.
If the Experian credit score is a Fico score than it will not be negatively affected by paying a collection in full and it updates on your cr.