This issue was discussed via email, sharing the below solution discussed.
Got it.. looks like you copied the shortcode from the below highlighted location and pasted it in the post’s “visual editor”
Below highlighted tag is contenteditable. So when you copy and paste from it, the shortcode is wrapped with contenteditable tag. So the shortcode is editable.
There are two workarounds,
1) you can paste the copied shortcode to notepad and copy it from there again to strip off the content editable tag.
2) use the “insert shortcode” button in the post editor toolbar.