sACN issues with certain fixture types

We discovered some strange things happening when using sACN with cetrain Fixture types.
From DMX 360 and higher no Data is expcepted by the fixture.
sACN Viewer and even DMX testers show data for these channels.

Swapping to artnet and all was fine. Also swapping to another brand of console and all was fine an sACN.
Has happend to 3 different people... There is a posting on facebook and Marco Silva had it in Portugal.
In my case and the one from Marco GLP fixtures had been used, the one on Facebook was Martin Viper