Not sure what I'm missing, but setting green alert at 8000 and red at 7600 when price is showing 7576 should make something change color, but it doesn't.
In that case, you should see price in red. Green alert appears when price is higher than 8000 (which it is not), and red alert when price is lower than 7600, which it is, and at least for me it correctly shows the price in red. Not sure why it wouldn't work for you, it's a pretty straightforward logic not dependent on anything else but the price and alert settings, at least for fixed alert setting.
If you want to see green alert, set it to, say, 7000 - but clear red alert as it overrides green alert if both are active (typically, red alert is supposed to be set lower than green).