Hi Carrie, I don't have any experience with your specific problem, I haven't had any issues like yours. So, not sure if I could be of any help? But based on the info and questions I've seen from here and your other posts. I would ask, in your widgets area are you using your instagram name or a specific tag? Don't use both, use either-or. And if you are trying to add it to a page or post make sure you use one or the other there as well, and not both.
So in a post or page you would have something like either of these two options:
[instapress userid="Your Instagram User Name" piccount="15" size="100" effect="fancybox" paging="1"]
[instapress tag="Your Instagram Specific Tag" piccount="15" size="100" effect="fancybox" paging="1"]
See the difference?
On a test I did, if you don't have either the tag or userid noted random pictures appeared on my site. For the second test I did when I add both a tag and a userid, nothing showed up. Not sure if any of this helps? But other than what I've stated, not sure I could help any further.
Hopefully it works for you.