Webstorm debugger does not respect stepping into settings

I am doing Node.js development using Webstorm.

Webstorm debugger going into some external module when I use the step over button. (I use step over button, not step into button).

For example it goes into module.js which is not my project file but an external dependency (see bellow):



According to my understanding, my Debugger setting should not allow this (see bellow). What am I missing?