You accidentally have two players that are the same. You can merge them together and all of their stats will also merge.

Go to Players (Menu > Manage > Players/Teams > Players).

Find the duplicate player.

1. Select both players. (select one, Hold CTRL and select the second one)

2. Click on Display More Options (Top right)

3. Click on Merge 2 players.

In the pop up:

4. Choose your Source: the player that will be copied INTO the Target Player.

5. Choose your Target: the player that will remain (Spelling, Operator, etc)

6. Ok.