-Ve Actuals in Oct TImeperiod

I have stats account, user is input the numbers for September Time period at base level in Actual scenario for Periodic combination and the -ve number are showing in October TImeperiod. that -ve number is YTD of September. as user is requesting to clear that October Actuals -ve data. Is there way that we can delete and also, I am surprised how this -ve number flow into the Oct Time Period. The flow is EndBal_Input. users are entering the number from quickview. Any suggestions to solve this issue?