URGENTLY . customers payments

Hello
I am a new user of the program manager
Customer payments 2019 no longer appear in reports in 2020

What reports?
Please show the edit screen of the reports in question

Some reports are based on period start and end dates

Have you been playing with Settings > Start Date, if yes then don’t.
Start Date is only for when you initially started with Manager, not for the start of a new financial year.