Yes, because we're no longer at the point of "programming" by writing in instructions (in the context of AI models). We are legitimately moving towards training AI the way a child learns. These AI image generators are given millions upon millions of images with descriptions, then they learn the general features. So once it's done and you give it a command, it does its best to create something from what it learned. And right now these AI's don't differentiate between the number of hands. Mainly because a good majority of images are showing clear views of hands. Most hands will be at an angle or even sideways. It also has no concept of how many fingers a person has. It's actually an incredibly good image.

What goes next to a finger? Another finger. So they offer fingers next to fingers and don't always stop at the right one.

https://youtu.be/24yjRbBah3w?si=ZSc3WDWyK6gM2aLJ