Image size half what it should be / Canvas size always 0

I am using latest PhotoShop from creative cloud on new MacBook Pro retina display. For some reason when I create a new canvas for an image OR save and open an image it only is displaying 1/2 the size it should be.
This happens for every image I open or try to create. Always 1/2 of what it should be and it even saves that way.
For example... if I save an image off the web that is 1040x400, open it in PhotoShop and just hit save, the image saves 1/2 of the size it should be at 520x200 even though Photoshop says it is 1040x400 when you view the image size...
Example continued..
The image on this website is 1040x400 pixels with a resolution of 72:
When I save the image to my desktop and open in PhotoShop, it opens at only 1/2 the size (520x200) even though it is at 100%:
When I view the image says it says it is 1040x400 but it is clearly not. It also always says the canvas size is 0x0 which make no sense:
This has got to be a setting but can not figure it out.
Thank you

Aggressive response but I do believe you.
I may not be as courteous or considerate as would be desirable but I see no inveracity or insult in my post so I don’t intend to apologise for it.
If you on the other hand consider your statement
if I save an image off the web that is 1040x400, open it in PhotoShop and just hit save, the image saves 1/2 of the size it should be at 520x200 even though Photoshop says it is 1040x400 when you view the image size...
can you truthfully say that your claim (Photoshop saving the image at the wrong size) was not incorrect?
In any case feel free to use the "Report Abuse" function if you feel I have violated the proper code of conduct, but please stick to this public Forum to articulate your point on issues that can well be discussed in and pertain to an existing thread thereon.
However, what you clearly do not understand is the concept of pixels in a retina display.
If Web Browser and/or OS makers decide that any number of non-vector and non-type image pixels should be upsampled to four times that amount of screen pixels then that may be of import for web design oriented Photoshop users but from an image editing standpoint for Photoshop to emulate that behaviour would seem not only unnecessary but even disruptive.
As far as I am concerned web browsers are not the ultimate arbiters of the "real size" of images.
HiDPI and retina display support FAQ

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