DMX output issue

Hi,

I am using a Hedgehog 4S in an auditorium. I took over from somebody else before and i noticed something i don't know how to resolve.

I have several clay paky washes and spots. Some of them seemed very dim compared to having intensity @ 100%.

I checked the DMX output and when i have them on 100% intensity, the DMX intensity output is on 40%. When i manually test that DMX address the light power doubles.  It seems like somekind of limitation put on the DMX or the fixture. 

Any idea how to take this off?

Many Thanks,

Csaba