I don't think that the flat grill should be doing this! This happened after the initial lighting/heating to season for the first time. Ive watched the videos for completing this procedure and followed it to the tee. Videos don't show those flat grills bowing in the center. Seems anything that i make on it that is liquid like to start will run off to the edges. Defect? Return it? I spent some hard earned money on this set-up.  ???