Hello! I am having a similar issue on a larger scale. I'm 99.9999% sure that someone is making multiple accounts to cheat the system. They created their account yesterday and the funnel accounts were all created since then as well; each of them is sending cards from the same series at ratios of 5:1. The extra accounts continue to be made and they are using different combinations of the same words for the different account names :<
They have 12 sub-accounts thus far and have nearly completed several series (including my own) in less than 24 hours using this method. :T
I have e-mailed the list to firstname.lastname@example.org but thought I should post in here as well in hopes that a moderator might hop on and see to cease this activity more quickly.