low tire preesure light

[TjMiller]

I got a screw in my front tire 2 weeks ago it eventually set off the low tire pressure light. I plugged it and filled to 65 psi checked the pressure in rest of the tires and all were good. Now 2 weeks later and the light is still on. I checked pressure all around today and even bumped the fronts up to 70 but light is still on. Am I missing something?