Twistie image won't display

RH 9 / WebHelp output

I added twisties to my project a couple of weeks ago and they worked fine.

Recently I re-organized my images and the twistie graphics were not displaying so I went into the css and updated the path.

The collpage icon displays fine, but the expand will not. I even tried using the collapse icon for the open icon and it still won't display. I put the images back at the root and re-did path, and nothing changed.

Attached pictures of the 2 outputs, and the code.

Have a release going out tomorrow so any help much appreciated.