Hi,
Thanks for using the Events Calendar.
I can try to help out here. I took a look at your site and see what you mean.
It looks like you have some custom css in your theme modifying things as that is not the standard look of the Event Bar.
Please take a look at that coding and remove it if you did not want it and then you might have play around with the css yourself to get it how you would like.
We try to make our plugins compatible with many of themes, but from time to time issue like this come up and for the most part are beyond the support we can provide.
I can answer any questions you have about this, but unable to provide coding to fix it.
Thanks