Your Philips grill plate is reversible so you can use the side you like. When you put the plate on the grill, please check the following.
How do I place the grilling plate of my Philips grill?
Make sure that:
- The flush drainage groove is at the front 
- The drainage groove with the rim pointing upwards is seated properly on the two plate fixation points at the back 
- When you touch the plate and try to move it, it stays securely on the grill 
For grills without fixation points:
The drainage slot with the rim around it has to be at the front over the grease tray.
Please also check the following:
The projections in the rim on the left and right side of the plate have to be at the back.
Note: When you touch the plate and try to move it, it should stay securely on the appliance.