Nothing. Very young pickled ginger will have the pink coloring naturally, mostly beet is used to dye it to give it the color when not so young ginger is used

There’s nothing wrong with it. Both are pickled. The pink stuff has a bit of food colouring.

In some cases it might be non-vegan due to cochineal dye but beet-based dyes work just as well. I guess you’d have to ask wherever you go.