Under on Flag bug

Product: Battlefield V
Platform:PC
Please specify your platform model. PC
AMD or Nvidia Model Number Nvidia GTX 970
Enter RAM memory size in GB 16 GB
Which part of the game is the issue happening in? Single Player War Story
Which part of the mode? Under No Flag
Please select your region Europe
On which server did this happen? European server
When did this happen? (dd.mm.yy hh:mm) Aproximatly 26th of december, 2018
Summarize your bug I recently finished the "Under No Flag" warstory on Battlefield 5, completing all the challenges and finding all the letters to get the unique melee weapon for multiplayer. When I finished the second act however, finding all 6 letters (even in the level it said "6/6 Letters found"), coming back to the main menu on the challenges it said I had only found 3 letters (the first 3 from act 1 of the warstory). It ocurred to me that the 6 letters from act 2 simply hadn't been registered. However when I go back to the mission to collect them again, they are gone, meaning that I really did collect them in-game. Therefor I cannot even get the unique melee weapon at all...it didn't unlock for me, not even after I finished the rest. It simply keeps stating that I need to find 6 more letters, while it says 9/9 letters found a few inches further to the right of the screen.
How often does the bug occur? Every time (100%)
Steps: How can we find the bug ourselves? By collecting the 6 letters from the second act of Under No Flag and coming back after the mission to realise the letters did not add to your challenge progress.
What happens when the bug occurs? I do not receive my promised unique melee weapon unlock
What should be happening instead? That it says 9/9 letters collected like it's supposed to and that i receive my unique melee weapon.

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Dear EA,

I recently finished the "Under No Flag" warstory on Battlefield 5, completing all the challenges and finding all the letters to get the unique melee weapon for multiplayer. When I finished the second act however, finding all 6 letters (even in the level it said "6/6 Letters found"), coming back to the main menu on the challenges it said I had only found 3 letters (the first 3 from act 1 of the warstory). It ocurred to me that the 6 letters from act 2 simply hadn't been registered. However when I go back to the mission to collect them again, they are gone, meaning that I really did collect them in-game. Therefor I cannot even get the unique melee weapon at all...it didn't unlock for me, not even after I finished the rest. It simply keeps stating that I need to find 6 more letters, while it says 9/9 letters found a few inches further to the right of the screen. Perhaps you guys can set this straight, as I really want this melee weapon, having worked for it for over 2 hours straight... Thank you in advance.

In the files given you can see the screenshots of my Battlefield with the letter completion stating I have 9/9 letters but also stating I only have collected 3/9 in the challenges.

Hope to hear from you guys as soon as possible,

Seasons greetings!

Sander, A.K.A Jace_867