Discounts aren't showing in cart

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Hi! We installed an app and they made some changes; they said that these changes would be deleted after removing the app but STILL there are issues left behind.

We used to have the discount preview available in our cart (so if an item was $20 and now $10, it would show the discount scratched off as usual) but now that code was removed/disabled and I cannot find out how they did it. We are using the Flow theme - any help would be appreciated as I know it must be a small quick thing to add! The cart page looks as normal, so is there another page? Maybe languages? Thanks