Inventory System not Recognizing other slots

So I was was using the tutorial system from this tutorial video:

It technically works fine, but the problem comes in when you try to use the action menu on any slots other than the first 2 slots in the top row. It gets weirder when the action menu opens when you right click on the item, but all of the values that are printed only come from the second slot.

I can’t upload videos but here’s a discord attachment to the mp4 showcasing the problem.

I’ve been trouble shooting so much today but I really have no idea what else I can do here.

Did you solve your problem?