I have a problem with the funnels in Google Analytics.

So I have a e-commerce website that I want to track the user path to a purchase. I want GA to track if a user goes trough these steps [Item page]->[Purchase]->[Checkout].

I thought this could be done by funnels and my setup currently now consist of:
Step 1: [Item page] (Required)
Step 2: [Purchase]
Goal: [Checkout]

But when I go to the "Funnel Visualization Report" the following shows.
[Item page] Visits: 150
[Purchase page] Visits: 170
[Checkout] Visits: 32

How can the [Purchase page] be higher than the [Item page]?

I searched the internet over, and found something called Horizontal Funnels but this doesn't show the correct numbers, again the purchase and checkout steps are higher than the item page.

So somehow it doesn't need step 1, to fulfill the funnels/goals.

What am I doing wrong?