A voided check appears in the bank reconciliation page

If the check was voided with a Journal Entry then it will have a corresponding reversal/voiding entry in the bank reconciliation to offset the effect.

In the bank reconciliation, user will find the Reversing Journal Entry at the Deposits and Credits tab and the Voided Cheque at the Checks and Payments tab. Mark them both in the reconciliation so that the net effect will be 0 in the bank reconciliation.