When you created the page, did you select the group from the drop-down "Add to this group's pages"
If you are the group's owner, you can make sure the group is selected by clicking the Edit tab.
Also make sure the checkbox "Make this the group's start page" is checked.
I admit this may have been confusing because after clicking the link to create a start page, these options were not selected by default. This has been fixed for the next build.