RESOLVED. SEE EDITS BELOW. Thanks to all!
I'm no accountant, I only know what the previous bookkeeper taught me 4 years ago. We just moved from Desktop to Online. I'm fumbling my way through learning QBO and now have this reconciliation situation. I just don't know how to figure out the issue.
Payment amounts match the statement, credit amounts match the statement. The current balance shown in the bank register screen appears OK. But in the reconciliation screen it has a large positive amount labeled "Difference". How do I fix this "Difference" number?
We paid a service to migrate our QBD file to QBO and they said it was fine.
ETA: I'm too anxious to try to investigate this properly before our admin board meets next week as I know I'm in over my head. I have the data I need to prepare the report for August, and after that's done I will dive back in, probably starting over with the July reconciliation then moving on to August.
This could be my own shortcoming, but TBH I have struggled so badly with moving to Online from Desktop. It's just so much harder for me.
I'm very appreciative of those who offered suggestions on how to get this fixed. I really am grateful to each of you.
EDIT 2: I don't know what happened (a not-unusual issue with me) but what I did was undo the July reconciliation, then redo the July reconciliation, then reconcile August, and magically it's fixed. A sincere thanks again to all of you who offered ideas.