When [Long] is selected for the backspin length setting, the backspin effect continues even after the jog wheel stops. Change the setting if you don't like it.

[rekordbox]

You can change it at [Preferences] > [Controller] > [Back Spin Length].

For details, refer to [rekordbox] > [Changing the settings in rekordbox] in the Instruction Manual.

You can read the Instruction Manual [here].