Why are my contacts messed up?

A

AC Question

My contacts on my Samsung Galaxy s6 are all messed up! It has multiples of one contact but when I go to merge none of them show up and when I try to manually delete some of the multiples it deletes the whole contact, not just one! And also the names are all out of order, like I will find a "k" name in the area where "t" names are supposed to be. Please help!