I noticed this would happen a few times on the main site I'm building with WP 3.3.2, but with the 3.4 upgrade it now seems to have stuck.
On the user submission form, whether the default layout or a customised layout http://wp-events-plugin.com/documentation/using-template-files/, even when the "This is a recurring event." checkbox is unchecked, the recurrence fields display at the same time as the non-recurrence fields.
So for example, below the above checkbox, is shows:
"Recurrences span from From [textfield] to to [textfield]
Events start from Event starts at [timefield] to [timefield] All day [checkbox]
This event repeats [dropdownfield] every [textfield] day days week on weeks on month on the months on the year years"
You can see this at http://gavinwebb.com/wp-sandbox/submit-event/
I use Headway Themes, but have tried the 2010 and 2011 themes too with the same problem (currently using 2011).
Also, on the test site, Events Manager is the only plugin activated.