You're seeing the difference between a File Management System and an Image Management System.
Finder is a File Management System and, since the picture file was just created, it's reasonable that the image file shows that date.
But you were asking about the date the Image was created, and you'll see that if you look at the picture in an Image Management System. That's why D.I. Johnson suggested that you import the pictures to a new Photos Library-- Apps like Photos and Preview will see the Image Creation Date and ignore the File Creation Date.
If it's important to you, you can use some 3rd Party apps to change the File Date to the Image Create Date. These data are stored in the Exif metadata, so you can do an App search using that. I use GraphicConverter ($40) for metadata stuff, but there are way cheaper things. I sometimes use the free! exifTool Reader to examine the metadata, but there are also exif editors that will let you change things.
Let us know what you do…