That is a sign of a trait (or ancillary, I guess) that is missing its description, like the Dignitas back in 1.0 that made the game crash with the roman starting faction leader occasionally... However, I am pretty certain that I caught all those mismatches in 1.1 (I created a validation program for it), so no it's not a known issue. You don't have any unofficial mod that changes traits, do you?
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