[Bug] Overlapping Nameplates

In Throne of the Tides earlier I noticed that on large pulls (such as Deep Murloc Drudges and Unstable Corruptions), nameplates were "spasming" when trying to overlap with each other. One second they would successfully overlap, but then the next they spread out like the option was unchecked and then repeat the process over and over until enough mobs died that they didn't need to overlap anymore.

"Allow Overlapping Unit Nameplates" was checked in the Interface options.