Hi @Doren
Thank you for response,
The opening balance of all expenses is $0. I have accounting knowledge, I have been using myob for more than 5 years and this is the first time something like this has happened. Every month, the same expenses are recorded (materials, fuel, etc.), some of the expenses are entered into the system as recurring transaction as fixed monthly fees (insurance, myob fee, etc.). In January, February and March everything was fine. I don't remember when, but it was at the beginning of April when I noticed that the graph with expenses looked different, that in April it was negative. I did not introduce new expenses.
I think there was an error in the operating system - but I don't know how to explain it, I'm not good with computers, there was a situation earlier where the problem occurred in the entire system (then I couldn't issue invoices for over a month) then the IT specialists said that something happened to the system while introducing the update (some error or something like that), maybe the same thing happened now.
Thank you for answer, have a nice weekend
Monika