Should be fairly obvious, but both TechReborn and IC2 use "plateIridium" for their iridium (alloy) plates.
Needless to say, other more popular mods also have iridium plates (the pure iridium kind) and it's causing dupes in every modpack that uses ThermalExpansion, PlusTiC and ImmersiveEngineering (which is most modpacks these days), where IE's metal press can turn ingotIridium into plateIridium; TE's compactor can turn both ingot and blockIridium into plateIridium and TiC can melt down iridium and recast as plateIridium.
Since TR's Iridium Plates are NOT iridium plates, they should be plateAlloyIridium to prevent future dupes, and promote the inclusion of TR into more modpacks.

According to choco, TechReborn is also forcing these ore dictionary changes on IC2's Iridium ore and Reinforced Iridium Plates; allowing infinite duping by processing IC2s non-ore Iridium Ore into multiple ingots, then recrafting it into multiple IC2 Iridium Ore. The same for their iridium plates.