Net income in P&L does not match to net income in Balance Sheet (QuickBooks Desktop)

Hi all, my company changed its fiscal year from July to December. Hence, the previous fiscal year was from August 2017 to July 2018 (12 months). The current fiscal year is from August 2018 to December 2019 (15 months). Subsequent fiscal year end is December (ie. December 2020, December 2021, etc.). Now, my net income in Balance Sheet does not match to that in the Profit and Loss.

1) What should be the first month in the "Company Information" set up? August or January?

2) I have set the same filters for both the Balance Sheet and Profit and Loss, but the net income is still different for both reports.

Thanks for the help.

(PS. I'm using QB Desktop, not QB online)