Hey Erin,
Sorry for your troubles here – the first thing I’m curious about is the Timezone Settings on your WordPress installation (Settings > General).
Next, what timezone are your events on Facebook in themselves? Are they mostly in the same timezone? If not, then do you notice any differences with date and time after importing the events in one timezone vs. another?
Finally, for now, can you clarify each of these pieces of information:
1. What version of WordPress is currently active on your site?
2. What version of The Events Calendar is currently active on your site?
3. What version of Facebook Events is currently active on your site?
Thank you!
George