Instacart says it has discovered and fixed a bug that withheld tips from shoppers and overcharged users since the end of 2017 Deirdre Bosa / CNBC : CNBC 2018-02-24 Deirdre Bosa CNBC, Instacart, Deirdre Bosa Related Coverage View article Gizmodo View article Recode View article Instacart News