Pixel selection issues, what I am doing wrong?

Often, when I try to select the pixels with the select either fast or magic wand, for some reason tool, the tool is picking up the strange habits of pixels in the image and simply delete the unwanted areas of the fair selection translated by picking up a different arrangement of pixels, so is unfortunately not a solution. Knowing me, it's probably something really obvious that I missed. I tried to reset the tools with no luck and I do not see why the file type (JPEG) must be the cause of all the problems... I'm quite a novice this ideas as a user of Photoshop! But here's a picture to give you an idea of what I mean:

Untitled-1.jpg

I have used earlier versions of Photoshop in the past and have never encountered this before. Can't seem to find advice online, so I'm puzzled! Any help would be appreciated, thanks.

Hello

According to adobe the cause is not having of processor graphics use enabled in Edit > Preferences > Performance

(restart photoshop after checking the box processor graphics use)

See this post

https://forums.Adobe.com/thread/1878037

Tags: Photoshop

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