Why people entering from category page goes to the homepage of my e-commerce as the second step of journey?

I'm trying to understand some data that I have on my hands. I intend to make a deep analysis but for this, I want to create a list of probable reasons that users take some actions. Then I can track different thing and test different strategies to have the right answer.

And I need your help to create this list of probabilities.

Let's go to the data: I lose 50% of the users that enter through any category page (product list) on my e-commerce and 40.5% these 50% that stay on my website goes to the home page.

The question is: Why? What could be the reasons to do it?