Problem with threat 4

I have a problem, I complete threat level 4 100%, but it keeps telling me that I still need to complete 1 level.
Since last week I repeat and repeat the mission, how did you solve that.
I don't know English and use the translator, thank you.
Since last week I repeat and repeat the mission, how did you solve that.
I don't know English and use the translator, thank you.
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