Store converted to blog

Hello,

I recently set up a store for a client, added all the products, pricing, variations, store SEO, product categories etc.

A few days later I noticed the product categories in the sidebar were missing. So I looked into it and found that my store had somehow converted from a store (with cart icon) to a blog (with pen icon).

Has anyone else had their store converted to a blog? How does this happen?

I've now deleted the blog and recreating it as a store again. 

But I'm frustrated and want to make sure this doesn't happen again.

Thanks for any input.