Major billing issues with 5.0.2 - Please help

[ncavalier (Nerik Cavalier)]

Linux Mint 20 instalation

I changed browser from Firefox to Google Chrome and now the problem partially resolved, we can input payment amount, but when we start posting secondary claims payments, its going to blank screen or to new payment screen [Screenshot from 2020-09-26 17-02-59] Now we can save payment info and start posting [Screenshot from 2020-09-26 17-04-23] When we press ok to Post Payment, its going to new payment screen [Screenshot from 2020-09-26 16-25-39]

We did all recommended php settings, but no any changes in secondary posting