Okay, this is weird... I received an order for a product despite the fact that I'm still getting error 14. The order was an off-site processing order (meaning I get the first and last 4 digits of the credit card on the back end, the middle 8 in an e-mail) -- yet offline processing is shut off.
Can I do screenshots? I can show you what I have for this project and another one regarding SIM to show you that everything set up is the same...
This is the screenshot for the current cart I am working on SIM

This is the screenshot for another cart using SIM that is not having any problems

I am beyond perplexed lol. Thanks for your help and patience.