its a known display bug (with several threads on the bugs forum here) on some Os's, but thanks. You will need to use your up/down arrow keys to see NONE.
As a side note, most users dont have the type of firewall that option is for, and need to leave it set to NONE
I see this is your first post here, welcome
we have a handy search feature... but when you use it, i'd suggest always setting it to "all forums" and expand the date range to get the best results