Image Creation Consistency

I’m new to ChatGPT. I’m creating images.
Each time I make a request to refine an image it has already produced, it gives me an image that (usually) has a completely different style to it. If I have it placing locations on a map, for instance, and I say “change font to Arial on locations” it (sometimes) changes the font, but then changes all the location icons, makes the map 3d and looks like the Old West. How do I constrain it to making ONLY the change I want and not completely changing the style of the image?

I did ask it not to change the style or other elements of the image.

It then changed all my map points from stars to little buildings.