With regards to void/reversing AP checks, there is a right way and a wrong way. You chose the wrong way. You should never never use the Void option (unless you have to in rare circumstances because Reverse isn't available). You should always use Reverse.
Not only does Reverse make a GL entry to debit Cash and credit AP, but it also updates the vendor transactions properly. So after Reversing, the invoices show up as outstanding again. (If the check being Reversed is to a non-vendor, then the credit is to expense, not AP, and the invoices don't show up as open). If the invoices then need to be adjusted, do not use Adjustment batch processing, instead use Invoice batch processing, and enter Credit Notes against each invoice, coding the credit notes to the expense accounts originally debited.
That's the theory. Now let's deal with where you are.
Voiding has the same effect in AP and GL as Clearing - which is to say none. You should enter adjustments in the opposite direction from the negative adjustments you entered, so that you can start fresh. Then enter the invoices again to the proper vendor, and pay them. Finally, enter a GL journal entry debiting cash and crediting the various expense accounts for the checks you Voided.
Good luck
Steve Schwartz