I have been using Events Calendar Pro since 12/17/12. The display was perfect until yesterday. I went in to add an event but just prior, I looked at the page on Chrome, Safari, Firefox, IE, and in mobile devices (droid, iPhone, & iPad) and the event page is pushed all the way to the left. I haven’t updated or added any plugins.
Is it possible that your theme was updated/changed? Can I also ask you to navigate to Events > Settings > Template and tell me what the default template setting is?
If you could try flipping this between the available options and see if you can find something that behaves as you would like that might be an easy way to solve this – but if not don’t hesitate to get back to me 🙂