Why don’t my city dots shrink when I zoom in on the map?

I recently made a svg quiz with cities and when I zoom in on the svg map, the dots don’t shrink. Do you know why?

Please not I added them myself, not using the jetpunk svg dot placer.

Here is the link. I could not get the anchor elements to work

https://www.jetpunk.com/user-quizzes/2141936/all-100k-cities-of-australia