When you posted your prior year adjustments you must select the correct period number to post them to (usually period twelve). The date is not relevent to the period number but in this case it would appear that you accepted the default period based upon the date you keyed in these adjustments. You have posted your prior year adjustments to period three of the prior year. To correct you need to reverse the prior period adjustments out of period 3 of the prior year and re-enter them as period 12 adjustments to the prior period.

The fact that your balance sheet's assets and liabilities do not equal has not been caused by the above posting error. Likley there is something wrong with how its set up.