So what? We got two livers for a reason, a main one and a backup.
https://zoonerdy.com/which-animal-possesses-two-livers/
The Myth of Two Livers
There is a common myth that some animals, particularly cows, possess two distinct livers. While this idea has been perpetuated in various cultures and folklore traditions, it is entirely untrue. In reality, cows, like all mammals, have a single liver that is divided into four lobes. This misconception likely arose due to the fact that the liver is the largest internal organ in many animals, and may appear to be multiple organs when viewed from certain angles.
The Truth: Animals with Two-Lobed Livers
While true examples of animals with two distinct livers are rare, there are some species that have a divided liver structure. One such example is the platypus, which has a two-lobed liver that is divided down the center. This structure is believed to aid in the digestion of the platypus’ unique diet of worms and other small aquatic creatures. Similarly, some species of marsupials, such as kangaroos and wallabies, have a liver that is divided into two distinct lobes.