Fix face shape keys after scaling head

I noticed some proportion problems on character which contains a few facial shape keys. The head was too big proportion to the rest of the body, so I scaled the head down about 20%. Now, when using something like “mouth open” shape key, the head grows back to it’s old size when the mouth opens.

Is there a way to scale or move parts of the basis and also take the shape keys along with it?

Do I need to remake all of my facial shape keys just because i want to change the head size?

I figured out what I did wrong. I spent 2 hours trying to figure it out and only discovered the issue after i posted.

I tried again, but unclicked the basis shape before scaling the head. Now it works as expected.