command block score_name and score_name_min aren't working.

i made this command block,

scoreboard players set @a[score_plot=1,score_plot_min=1,r=8,score_zone=!1,score_zone_min=!1] zone 1

but i found it is ignoring the score_zone=!1 and the minimum part.
not sure if i am doing something wrong or this is a bug, and yes i did make the dummy variables and all with commands.