Recently they got a letter in the mail explaining they had been chosen as recipients of this Amazon Smile money. The thing is, they never chose to be featured on Amazon Smile. Amazon used some database of non-profits (that they had never heard of) in order to present options to customers, then notified the non-profits later. The letter specifically said that in order to collect the money, they needed to create an account with Amazon smile.
PayPal is probably just pre-populating their list of charities, failing to fully notify recipients of the donations, then saying "Whoops, I guess we got to do something with the money."