Items are removed from cart when proceeding to checkout from '/cart' page

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I am currently running a buy 3 get one free promo on my site. So if the user adds 4 of an item to the cart then one of those items has its price set to 0.

Every thing looks fine on the cart review page, but when I continue to checkout, I lose 2 items and only see 2 items in cart. This issue only happens when

clicking the 'continue to checkout' button which submits a POST to /cart. If I navigate to /checkout, then this bug does not happen. 

Could this be an issue with the discount that I am applying?

I just need some direction of where to look, whether it be code or some setting that is not set up properly.

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