Canvas Extension colour

Hi All

I have an action which edits the image size and canvas size.

For the canvas size i noticed that the extension colour (background extension) is always stuck on blue, I want it to be white, It was white before and all of a sudden changed to blue. 

I recreated the action but no luck, I tried editing the 'Canvas size' action and changing it from blue to white, but it doesnt seem to save, when i click back into it, it changed back to blue, therefore when i am bulk editing images, the backgrounds are blue rather than white.