David Anderson on "[Plugin: UpdraftPlus Backup] Can we schedule older backups to be deleted so it doesn't take up too much room"

Does UpdraftPlus still show 15 sets, even after the job has finished and you refresh the UpdraftPlus page? If so, then it seems that the job that finished was started when the setting was still 15. Once a new run finished now that it's set to 1, it'll clear all thsoe out.