Malformed Comment box

My site URL is http://appletechtalk.com I am using the Simple Catch (are) theme. I am using a plug in called Comment Notifier which allows a user to check a box to be notified when a comment is responded to. In addition to adding the check box it adds text that says: Notify me when new comments are added. (Similar to what you have below.)(You have to be logged in to the site to see the comment and box.) On my site, the text is not on one line but looks like this: Notify me when new comments are added. I reached out to the developer of the plug-in and he looked into it and says it is an issue with my theme. Can you suggest some way I can fix this, or do you have a recommendation for a better way to do this? Thanks, David