Hi @Jenny1901
We're all wondering too! 😊
Airbnb calls these "bubbles" and the smaller ones without prices started appearing on the map in 2022 (I think?). This was when Airbnb switched to an "interest" algorithm and when the categories feature appeared at the top of the search page. The guest search feature algorithm (and how the map appears) is dependent on many variables (your past searches, what filters you use, if you add pets or infants to your searches, etc.). How it appears also depends on how "popular" a listing is according to the Airbnb algorithm.
If you click on the smaller bubbles (or larger ones) you will get a thumbnail of the listing to click further. You can click on the map and move it around and enlarge or reduce the size and the "bubbles" will appear/disappear depending on the area you are targeting.
Maybe another Host can chime in here and explain why some lisitngs are displayed with a large bubble and price, while others are smaller bubbles with no price? I'm guessing it has to do with the search algorithm Airbnb uses.