I use Thrive Automator to subscriber a new user at a website (Read.SwimISCA.org) to a list at Constant Contact.
Sadly, where there should be 100+ new subscribers only 11 appear.
I could see above contacts are not added to any list. Its look like connection feature at API may be the cause for contacts not adding in the account. I request you to call our technical specialist team available on phone who can further look into the issue. You can call our phone support at 866-289-2101.