Why are Skada and WCL radically different? (M+)

I think this is only happening in Mythic+. Overall DPS between Skada and WCL are about ~10-25% apart, WCL being the lower number. At first I thought it was overkill damage, because so many mobs are being overkilled, but that didn’t even come close to the disparity.
I tried Details dmg meter, it’s the same thing.
I have Advanced Combat Logging turned on and I am mostly using live logs.

Do they know to treat a Mythic+ dungeon as a single encounter? I suspect they’re just excluding the downtime.

Set Skada to show Total rather than Current Encounter, and reset it just before the instance starts. It will be close after that.

That’s most likely it! Thanks.

That’s what I’ve been doing, not close at all.