R2 only outputting 0.16 pressure

As far as I know, R2 and L2 output values from 0 to 1.

I noticed that playing racing games i could not push throttle to the max.

So I checked in https://gamepad-tester.com/ and at max pressure it is only outputting 0.16 at most.

I tried dissassembling the gamepad and everything seems fine inside. I even tried pushing the circuit itselft with my finger and I got the same result.

Does anybody know why this is happening?

The DS3 I'm using is the one with vibration and sixaxis all together.