True, a manual coupon should have priority over an auto coupon. Can you send me the url to your store and the coupon codes so I can take a look? What are the coupon’s settings? Are both checked as ‘Individual Use’?
I did finally figure it out – whoever setup the coupon on our team had a category that should have been excluded in the included section, which ended up excluding what we wanted it to apply to. The typed coupon now overrides the auto coupon. However, the description of the coupon no longer shows up in the cart like it does normally, but I’m willing to go with that for now.