Typing '5' with numpad in an input field after another number erases first number
Try to buy '25' lizards, get '5'
When typing numbers into input dialogs, such as buying cooked lizards, pressing '5' after another number will delete the first number. This is with numlock on using the numpad (with numlock off, numbers can't be typed in).
When typing '135', the dialog will appear as '1', '13', then '15'.