Boetie

Hi all. I'm strugeling for almost three mothes with my four shoto 5.12kwh batterys. I got two 5kw mpp expert inverters two of the batterys does not charge more then 50% and one 75% and the orther one 100%. What i dont understand if i charge these batterys separate thy only charge to what i just said. All i know is that the Inverter and batterys dont't communicate with each orther. Now my Quistion how can i get these batterys to charge to full capacity. Thank you so much.