Shopify Free Gift App Problem

We are using the Seccomap Free Gift App and have discovered a problem that is either coming from another app or is a loophole. We have a special that allows customers to get 2 free fish when they purchase 10. However, in the past couple of weeks, we have had a few customers buy one or two fish and then continue to load a couple of hundred free fish into their cart. We have worked with the Seccomap Support Team but this is what they have come up with: