Unable to complete a weekly challenge

Product: Apex Legends
Platform:PC
Please specify your platform model. PC
AMD or Nvidia Model Number Nvidia GeForce GTX960 4GB
Enter RAM memory size in GB 16gb
What is your gamertag/PSN ID/EA Account name? SancukoSan
Please provide your squad mates' gamertag/PSN ID/EA Account name if possible.
Are you using any software with an overlay? No
Which Legend were you playing (if applicable)? Wraith
Which Legends were your squad mates using (if applicable)?
Where did the issue occur? Returning to the lobby after a match
Which part of the map or menu were you in? If you don't remember the exact name, please describe the area or what you were trying to do in the menu. Weekly Challenges
What were you doing when the issue occurred? E.g. respawning a squad mate at a beacon, using an ability, a squad mate left the game. I have returned to the lobby after a match
Did your squad mates also experience the issue? I don't know
How many matches had you played in a row before the issue occurred? I don't know, maybe 7 or 8
When did this happen? (dd.mm.yy hh:mm) 19/08/2020
How often does the bug occur? Rarely (0% - 9%)
How severe is your issue? Minor impact to gameplay
What happens when the bug occurs? There is a weekly challenge to get 5 kills in a single match, and after I got those kills in a single match, I returned to the lobby I have noticed that the challenge wasn't complete.
What should be happening instead? Get 5 kills in a single match
Steps: How can we find the bug ourselves? I don't know, I guess you need to investigate this.

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Hi,

I have noticed that there is a bug with the Weekly Challenges which I'm not sure why is not completed. 

There is a weekly challenge for getting 5 kills in a single match, and after I got those kills in a single match, I returned to the lobby I have noticed that the challenge wasn't completed.

Please find my attached screenshots.