ProChannel is upstream of the faders. So the clip lights indicate that the signal going IN to the PC module is too hot. If it's the first module in the chain, then only thin you can do is turn down the channel gain, as that's the only thing that comes before the PC, in a standard setup.
The other way this could occur would be if your PC was set to be post FX bin, and something in the effects bin was making the signal too hot at that point.
Your fader level and channel output meters have no bearing on this whatsoever. They're downstream of the problem.