Which version of nUI are you running?
This was a known issue in prior versions, but I had thought it was fixed as no one has reported that in a very long time.
And, no, it's not a case of mistaking retribution for restoration... nUI gets the build title directly from WoW. It's a case of a query having been started to get a player's build and then the raid roster or your target changing before it was complete and the new raid member/target gets assigned the other character's build when it shouldn't have.
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