It really does sound like there might be something wrong with it, if you've tried more than one can.
Please, please don't take chances with it - that was how I lost my eyebrows, eyelashes and the front inch of my hair - a failed O ring in one torch failed, leaked gas and as I moved the flame, moved it into the cloud of gas that had accumulated around it and the entire incident lasted about half a second and some of my hair still hasn't grown back, a year on.
And please don't try lighting it in the same place you've been buggering about with the gas. I always fill mine at least in a different room (preferably outside) and come back to my work area and let it settle before using it.
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