Incorrect rank/rewards

Product: Apex Legends
Platform:PC
Please specify your platform model. PC
AMD or Nvidia Model Number 3070
Enter RAM memory size in GB 32
What is your gamertag/PSN ID/EA Account name? YasuoKnife
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)? bloodhound
Which Legends were your squad mates using (if applicable)?
Where did the issue occur? In the lobby (waiting area before the 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. main menu
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. waiting in main menu
Did your squad mates also experience the issue? No
How many matches had you played in a row before the issue occurred? about 20
When did this happen? (dd.mm.yy hh:mm) JST 6:30
How often does the bug occur? Rarely (0% - 9%)
How severe is your issue? Major impacts to gameplay
What happens when the bug occurs? When I raised the level of my new account to 20, the rank of the previous split was master. I played one match and it didn't fixed.
What should be happening instead? I shoud be rookie.
Steps: How can we find the bug ourselves? Check my account.

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It was wrong rank.