Menu Item Spacing Issue on 2 devices

I’m working on my menu items for each device type.
For whatever reason, I’m unable to space out my menu items for portrait cellphone and portrait tablet devices.
The way I’ve been able to space out menu items on all other devices is to untick same size, increment the spacing, then click the same size back on.
Anyone have any ideas on what my problem could be?

Sorry, forgot to add that I have a vertical menu.

Solved it. When I widened the menu item elements of the vertical menu for the affected devices, element spacing worked!