Hi all, I am very new to Zbrush and as expected, encountered some problems right from the start. 
Using an online tutorial, I started my first project using Zspheres and converted it to polymesh3D. The polymesh I got looks different from the tutorial or most other ones I have seen. Here is the screenshot:

The ribs look too thick and even after dividing in the Geometry menu, the number of polygons remain the same, but showed an increase in mesh only with SHIFT+ F screenshot:

Here’s what most other ones I have seen suppose to look like:

I have followed the tutorial step by step, but upon converting to Polymesh 3d, mine starts to look strange, what am I doing wrong here, any help is appreciated! Thank you so much!