Cuisinart 3-1 Unknown-see information in report

SaferProducts.gov consumer incident report 20200721-F8798-1998075. Severity: Incident, No Injury. Product: Cuisinart 3-1 Unknown-see information in report (Cuisinart 3-1 five burner grill). Incident: On or about June 5, 2020 I purchased a Cuisinart 3-1 5-burner grill from Walmart in Delavan, WI. The unit had been fully assembled by Walmart. The advertised price was $347 plus tax which I paid in cash. A Walmart employee named -------helped load the unit into my vehicle. I spent the next several days trying to absorb all the warnings and instructions contained in the Cuisinart Grill Operator booklet. I also stapled the purchase receipt into that booklet. On June 9, 2020 I returned a propane tank to the Clinton, WI grocery store because it was malfunctioning in that it was not producing any gas. The store owner/mgr [REDACTED] provided me with a replacement tank. Both tanks were furnished by the [REDACTED]. Because it was starting to rain from the hurricane Cristobal which was just entering our area, I had the grill about 2-3ft. in the garage. I set the tank on the tray underneath the grill and connected it to the grill regulator. A soap test on the newly connected tank did not indicate any leak. The new tank produced gas and all 5 burners on my grill ignited immediately. The side burner, however, would not ignite. Per the instruction booklet, I proceeded to let the grill burn for 10�15 minutes. There was no obvious sign of any problem. I periodically checked the temperature of the grill on the closed lid thermometer and it eventually reached 500 degree+/-. At about 12 minutes, I decided to shut it down by turning off the tank valve first... per the instructions. When I bent down, I saw yellow flames quietly burning in the area of the tank connection to the grill hose. I at