Platinum 5 player with a gold 3 border?

Hey guys, so after i finished season 8 i got the platinum 5 border and i had it a few weeks, but suddenly in a game last week it showed a gold 3 border in a normal draft game. Can someone tell me if this is a bug or what is going on :/ Edit: It hasn't fixed itself in the latest patch and I have had it for maybe 10 games or so now
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