How to disable auto change "- -" to "–"

Hello,
I get the follow error:
ex this link for image: https://lh4.googleusercontent.com/—QeoQytI2G0/TljHm8Ua5FI/AAAAAAAAuGg/eGTVDLb9cqk/s720/DSC05765.jpg

WordPress auto change “–” to “–”: https://lh4.googleusercontent.com/–QeoQytI2G0/TljHm8Ua5FI/AAAAAAAAuGg/eGTVDLb9cqk/s720/DSC05765.jpg

So, the image can not display. Please help me how to disable auto change “–” to “-” in wordpress.

Thanks so much!