class diagram rendering wrong

[jianchundev]

@startuml package "gui" { Game --> "1" Player_manager Game --> "1" Display_manager

abstract Updatable

Players_layout --|> Updatable
Player_manager --|> Updatable
Display_manager --|> Updatable
Character --|> Updatable
InputBox --|> Updatable

abstract Gui_control

Players_layout --|> Gui_control
Player_manager --|> Gui_control
Display_manager --|> Gui_control

Display_manager --> "1" InputBox
Display_manager --> "1" Player_manager 
Display_manager --> "1" Players_layout

Player_manager --> "1..*" Character

}

package "connection" { Network --> "1" ConnectionManager }

package "model" { Game_state --> "1.." Player Game_state --> "" Collectable }

package "control" { Katch --> "1" Game_state Katch "1" -- "1" ConnectionManager Gui_control --> "1" Katch }

class Updatable { void update() }

@enduml

should:

but:

[jianchundev]