The part you replaced is not the control panel. This is the control board which probably has nothing to do with the buttons problem. You have to order and replace the control panel.
In regards of the ignition problem very likely it caused by a bad spark module, especially if the new igniter did not fix it. You may want to check the wire between the igniter and the spark module first.
- The control panel Part number: 5760M339-60
- The spark module Part number: 71002783
Here are the breakdown diagrams and Parts for Jenn-Air JGS8860BDP Range - AppliancePartsPros.com