Responsive not working above 320

i have specified responsiveness using current page width, e.g >240 and <320, i did this upto 1200 , so everything else is working fine but when i go past 320 my elements shrink and they will start to appear normal somewhere around 420 at least but i have set a conditional of >320 and <768

where i am going wrong i need help

Hey, can I have the editor access?