Security code denied

Hello,

For the most part, Give has worked well for us and our supporters. However, a handful of donors have had trouble donating on our website. They fill out all the info, click donate, and get an error message saying the credit card security code is not valid. Usually, they’ll try again with another card, or call me and I run the transaction through our website, while I am logged out, and it works fine. Any idea how we can assure this doesn’t happen anymore?

Thank you very much!
– Tia

https://www.ads-software.com/plugins/give/