PNG Turns Image Blue

[landscape_snarkitect]

Hi, I made the attached image in Photoshop. In the original image, the birds are red, but when I export to PNG, they sometimes appear blue in the image viewer (and subsequently turn my people into Smurfs). I exported to a JPG and it doesn't seem to hinder it, but now I am curious why this is happening. I made this image years ago and have viewed it as a PNG many times, but I have never seen the image turn blue until now. 

Any thoughts on why this is happening and how I can avoid this with future PNGs? What changed that might have influenced its view settings?

Original image exported as JPGImage exported as PNG

[Semaphoric]

What is the file format of the image, a .PSD? Could you post a screen shot showing the Layers panel?

[davescm]

It looks like your image viewer is reversing the blue and red channels. Can you attach an example png with the issue and also show your export settings that you used to make the PNG

Dave