Heiman Zigbee LPG Gas Natural Gas Detector - Not Detecting Gas

Hello, back in January, I purchased this Heiman gas detector to use with my LP Gas stove. Thanks to the Smartthings community, getting it recognized by ST was a breeze.

When I press the button on the device, it displays a notification that Smoke was detected (okay, that’s weird but I can live with it.)

However, if I leave my stove gas on, it does not detect gas. I’ve plugged it in, about 10 inches away from my stove, so for sure it should be able to detect the gas.

Has anyone had a similiar problem? Has anyone actually tried it when there was gas in the air? Has anyone tried this with LP Gas?