Hi Jonathan,
Thanks for reaching out to us on this, and sorry to hear about the many issues you list.
Let me start by saying that we are not allowed to log into client sites backend. Anyway, I could verify the issues you note, and I suspect this might be an incompatibility with the theme.
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.
And a note on the Organizers drag-n-drop, that is the intended behaviour, as there can be multiple organizers per event this works to re-orden them.
Please let me know about it,
Best,
Nico