Hey! We fixed it indeed by correctly configuring the edids. The problem was that we had 2 EDIDs corresponding to the different LED controllers we use, Brompton and Helios megapixel.
And we had to configure all the edids using the megapixel led controller! so that they all 3 pcs had a helios EDID instead of 1 pc a brompton edid and the other 2 Helios.