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It is probably a bug.

I am having this problem too. I read online that it may happen near the Gilbert Alexander battle with all of the Houdini Splicers, that loading & storing it in the Gene Bank during the battle may help solve the problem.

I however got it during this battle & equipped it, I didn't test it out to a bit later & have no save game near here so I cannot confirm that this fixes it, just that I also have the bug.

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