Hi Kristen,
Sorry for the issues you are having. I can help troubleshoot this with you.
How may different events are you trying to import from each site?
How many events are imported and how many have not imported?
Can you provide the list of pages from the settings in a private reply?
Also, in a private reply can you let us know your hosting plan? We maybe running into server resource limits, but not sure yet.
Also, did you find out anything about the past events duplicating? I looked at your other thread, but did not see if you got back to us. Is it still doing it? Is it on all events or from a specific page?
Let me know and we can go from there.