Background image displays greyed out/darker on some mobile devices?

Site URL: http://cohoopsacademy.com

All,

I have added an image to my site background pages and it works great on desktop browsers.

But on mine and a handful of others iOS phones the image is "dark" but on some other iOS and Android phones it works fine??

How can I fix this, it makes no sense??

Please advise - thanks!!!

Hi. Have you solved it yet?

I also see other problems.

If you need to fix, just reply here, we will support.

Site URL – https://cohoopsacademy.com/

1. (Smaller screens – Header) Make all nav items same line?

2. (Tablet-Homepage) Increase content width?

3. (Mobile-CHA Programs) Center these text?

4. (Tablet-CHA Programs) Center Premier program text?

5. (Tablet-Overlay) Need to scroll down to view social icons. Want to move it up a bit?

6. (All screens – Cost fees) You haven’t changed SEO Title so the browser tab name still shows “Store 2”

7. (Cost fees) Image cut off