This could be linked to RUNTIME-1590 , although it is not as blocking as in Internet Explorer.

If you have list with the style "custom" (the one with arrows), the list behave strangly : If you click on a list item,

• You can't use suppr at the end of a list item,
• you can't use backspace at the start of a list item,
• you can't exit the list item with the arrows of your keyboard, but you can move inside it without problem
• mouse selection by holding left clic is also locked to the list item if you start your selection on that item.

This does not happen if you initially enter the list item with the arrows of your keyboard.