Originally Posted by sbanks
In Wordpress - in Settings -->Reading I set the "Front Page Displays" to the "Store" page. This removes the /store from the store URL.
This may be the issue, though it's hard to say. You don't have to do this step in order to get the store to appear on the homepage.
Also, what is the slug of your current "Store" page?
If a new page gets created again, can you try to outline the steps that led to that happening?