Why is my main banner image not resizing correctly for mobile?

[cmkruemcke]

Home page, main banner image is no longer responsive. It used to resize correctly from desktop to mobile and my preview shows it correctly, but when I hit save it goes back to the size of the desktop image. Please help me fix.

This is my preview and what it should look like on mobile :

What it should look like

This is what happens when I hit save and what is published on mobile :

What is reverts to when saved and what is showing on mobile

Desktop view :

desktop image

[Minion]

Hey @cmkruemcke 

I just checked your mobile site and saw that you were able to get the banner to display correctly how you wanted as described above.  Did you happen to do anything specific that fixed the issue or was it maybe a potential bug in Square that was stopping it from showing correctly?