i beat a 2500 is there a bug

[Event "Live Chess"]
[Site "Chess.com"]
[Date "2020.07.25"]
[Round "?"]
[White "s78s75"]
[Black "JBC10"]
[Result "0-1"]
[ECO "C47"]
[WhiteElo "2552"]
[BlackElo "1301"]
[TimeControl "180"]
[EndTime "8:18:05 PDT"]
[Termination "JBC10 won by resignation"]

1. e4 {[%clk 0:02:59.9]} 1... e5 {[%clk 0:02:59.9]} 2. Nf3 {[%clk 0:02:58.6]}
2... Nc6 {[%clk 0:02:58.5]} 3. Nc3 {[%clk 0:02:58]} 3... Nf6 {[%clk 0:02:57]} 4.
Bc4 {[%clk 0:02:57.3]} 4... Nxe4 {[%clk 0:02:55.1]} 5. Bxf7+ {[%clk 0:02:53.1]}
5... Kxf7 {[%clk 0:02:55]} 6. Nxe4 {[%clk 0:02:51.5]} 6... d5 {[%clk 0:02:54]}
7. Ng3 {[%clk 0:02:50.1]} 7... Bd6 {[%clk 0:02:50.9]} 8. d3 {[%clk 0:02:49.1]}
8... Rf8 {[%clk 0:02:49]} 9. Bg5 {[%clk 0:02:47.4]} 9... Be7 {[%clk 0:02:46.8]}
10. Bxe7 {[%clk 0:02:45.9]} 10... Qxe7 {[%clk 0:02:45.5]} 11. Qd2 {[%clk
0:02:43.4]} 11... Kg8 {[%clk 0:02:40.4]} 12. O-O-O {[%clk 0:02:40.6]} 12... Bg4
{[%clk 0:02:37.3]} 13. Rde1 {[%clk 0:02:34.2]} 13... Bxf3 {[%clk 0:02:29.2]} 14.
gxf3 {[%clk 0:02:32.5]} 14... Rxf3 {[%clk 0:02:27.9]} 15. Rhg1 {[%clk
0:02:30.2]} 15... Raf8 {[%clk 0:02:23.5]} 16. Nh5 {[%clk 0:02:28.2]} 16... Rxf2
{[%clk 0:02:10.1]} 17. Qc3 {[%clk 0:02:24.8]} 17... g6 {[%clk 0:02:02.1]} 18.
Qb3 {[%clk 0:02:09.8]} 18... Qc5 {[%clk 0:01:43.4]} 19. Ng3 {[%clk 0:01:57.9]}
19... Nd4 {[%clk 0:01:37.7]} 0-1

[Event "Live Chess"]
[Site "Chess.com"]
[Date "2020.07.25"]
[Round "?"]
[White "s78s75"]
[Black "JBC10"]
[Result "0-1"]
[ECO "C47"]
[WhiteElo "2552"]
[BlackElo "1301"]
[TimeControl "180"]
[EndTime "8:18:05 PDT"]
[Termination "JBC10 won by resignation"]

1. e4 {[%clk 0:02:59.9]} 1... e5 {[%clk 0:02:59.9]} 2. Nf3 {[%clk 0:02:58.6]}
2... Nc6 {[%clk 0:02:58.5]} 3. Nc3 {[%clk 0:02:58]} 3... Nf6 {[%clk 0:02:57]} 4.
Bc4 {[%clk 0:02:57.3]} 4... Nxe4 {[%clk 0:02:55.1]} 5. Bxf7+ {[%clk 0:02:53.1]}
5... Kxf7 {[%clk 0:02:55]} 6. Nxe4 {[%clk 0:02:51.5]} 6... d5 {[%clk 0:02:54]}
7. Ng3 {[%clk 0:02:50.1]} 7... Bd6 {[%clk 0:02:50.9]} 8. d3 {[%clk 0:02:49.1]}
8... Rf8 {[%clk 0:02:49]} 9. Bg5 {[%clk 0:02:47.4]} 9... Be7 {[%clk 0:02:46.8]}
10. Bxe7 {[%clk 0:02:45.9]} 10... Qxe7 {[%clk 0:02:45.5]} 11. Qd2 {[%clk
0:02:43.4]} 11... Kg8 {[%clk 0:02:40.4]} 12. O-O-O {[%clk 0:02:40.6]} 12... Bg4
{[%clk 0:02:37.3]} 13. Rde1 {[%clk 0:02:34.2]} 13... Bxf3 {[%clk 0:02:29.2]} 14.
gxf3 {[%clk 0:02:32.5]} 14... Rxf3 {[%clk 0:02:27.9]} 15. Rhg1 {[%clk
0:02:30.2]} 15... Raf8 {[%clk 0:02:23.5]} 16. Nh5 {[%clk 0:02:28.2]} 16... Rxf2
{[%clk 0:02:10.1]} 17. Qc3 {[%clk 0:02:24.8]} 17... g6 {[%clk 0:02:02.1]} 18.
Qb3 {[%clk 0:02:09.8]} 18... Qc5 {[%clk 0:01:43.4]} 19. Ng3 {[%clk 0:01:57.9]}
19... Nd4 {[%clk 0:01:37.7]} 0-1

That 2500 rating was received by the first win and the player isn't really that high rated. Just looking at the rating graph shows the rating is plummeting.

no you can only start at 2000 

and that is what i thought too but i looked at his games and he beat a 2400

and a 2030

so yeah

s78s75 closed his account 5 days later, I dunno why

This is 2 years late, but as Martin noted, the first win or first two wjns might have led to an initial jump of rating from 2000 to 2500.

k