That's a feature though.
Coincidentally it only happens when you paste the data or if you messed up the generation of the file (didn't escape the column you want to leave untouched).
To me it seems like a case of you're holding it wrong. (which I don't wholeheartedly support)
Also, the main problem is that excel changes your input instead of just misinterpreting it. The difference being, the original will be gone.