When unpacking the range at first, the bottom plate is not placed on the bottom of the oven cavity. Before operating the oven, install the bottom plate properly as steps below:
Take out the bottom plate from the oven cavity.
Take off any packing material covering the bottom plate.

Use both hands, grab and insert the bottom plate inside the oven cavity.
Check the direction as the bottom plate has front side and rear side. Make sure to insert the rear side heading towards the oven cavity.

Front Side
Rear Side
Slightly tilt the bottom plate to place it completely under any protruding part of the inner rim of oven cavity.

If installed properly, the bottom plate fits into the bottom of the oven cavity without gaps and is flattened overall.

Make sure that the bottom plate is properly installed. Failure to do so can result in improper operation of the oven.