LED Fixture Not Responding in Cue

In addition to 24 channels of incandescent dimmers, we have a few Chauvet SlimPar H LED fixtures on a CS20. Two DMX runs through a splitter. The fixtures respond fine while programming and setting levels but do not work correctly when playing back cues. They will come on at maybe 10% but not to the programmed levels. Have termination on both DMX runs and have tried removing terminators with no change. Have tried removing one of the DMX runs. No change. 

Am running the fixtures in 7 ch mode. Everything else seems to work fine, including color programing. Just not when playing back cues. Any troubleshooting suggestions?

Thanks in advance.

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