Hi there Derek,
Thanks for getting in touch with us and sorry to hear about this issue!
Let me say it’s not a known issue and not something I heard before. Can you please follow the steps described in our Testing for conflicts guide? This way we can see if this is a problem in our plugin or a conflict with the theme or other installed plugins.
Also, a new plugin is going to be released in the next few days, it’s called Event Aggregator and will eventually replace Facebook Importer. After it’s release (hopefully) tomorrow, you can give it a try (a license for it will be granted to Facebook Events license holders) and see if the issue persists.
Please let me know about it,
Best,
Nico