weapons locked but i complete all challenges

hello dears

i was working on the weapons challenges and i was in the middle of it to complete it , but after the update when the challenges reduced it shows me that the challenge complete and i should work on the next challenge , the problem is the weapon still unlocked , i tried many things , i kept working on the other challenges and complete all the weapons challenges now but still there is 3 weapons still unlocked because i was in the middle of the challenges when they got reduced, there is one other way i will try to do it and check if it works or no, i will to pick up this weapons from other players or bots and try to level it to level 10 to get the mastery blueprint its will take time but there is no other way in my mind pls try to fix it ASAP 

thanks 

regards,