Not normal if your propane tank(s) are full and turned on. It should light first try, but if your turning off the cylinders for travel, then you may have a leak. Turning off the propane, the pressure will bleed off after a period of time. How long is what we test for any signs of a leak.
I will turn the gas on, light the stove and once I have a steady flame I will shut off the burners. Then using a manometer, I will test at one of the burners. RVIA standard is 0" drop in WC for 3 minutes. I like to test for 10 minutes. If you can afford a manometer, you can test yourself, and I can tell you the procedure. IF you have an LP leak it's nothing to play with and NO you can't always "smell" a leak.
Amazon has manometers, but I don't know if you want to invest in one for a single use. Obviously I use mine all the time so I have my own in my tool box at work. If your considering buying one this is the one I have
https://www.amazon.com/Yellow-Jacket...ords=manometer
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.