0-10v Problem

I have installed a Unison Foundry Mini Panel to control several recessed LEDs in a renovated space.  There are 4 zones.  The smallest zone is 8 fixtures and the largest is 26.  All of the fixtures are Lithonia LDN6 0-10v down to 10% and the electrician has them wired up 277v.

The problem is when I bring the light slowly up from the off position... there is a burst/flicker from many if not all of the units.  It's almost like there is a surge in the DC voltage.  Looking for ideas on how to resolve or where to begin.  Thanks!

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