Only letters of names and surnames are used in bibliography instead of the authors full name

In every Style that I choose bibliography looks like:

JA E, K Z, T M, Y S, C H, JO P, N L, CM G, X Z, J C, T K, AJ H, AM R, F C, T M, C L, BE J, LC C, PA J (2007) MET amplification leads to gefitinib resistance in lung cancer by activating ERBB3 signaling. Science (New York, NY) 316.

There are only first letters of name and surname… not full surname…

Do not know why…