Hello. Why do I have an amount allocated to the uncategorised income account at the month end, after all products and services have the income account selected to sales?

All reconciliation, between bank transactions and invoices have been matched. Yet, at month-end there are the "undeposited funds" and also the "uncategorised income" with some amount in them. If I just make a journal clearing them, will it cause any imbalance in the reconciliation done? Thanks in advance.