Forty-seven offers for $58 works out to about a buck twenty each, and app coupons stack with store sales while paper ones often don't. Feels like you picked a bad app and compared it to one lucky BOGO.

Ugh, the hidden row thing gets me every single time. I check mine now by adding a couple test numbers I know the answer to, like 5 plus 5, and if the total is wrong I know something is off. Also I just scan the whole sheet and look for rows with no data showing, they hide weird. Six hours on a Saturday hurts but at least you caught it, I went like a month once before I noticed mine was double counting.

Learned the hard way that most things work best somewhere in the middle.