Hi Anita,
I believe the issue stems from some css in your custom.css file. Specifically:
.container .clear {
clear: none;
}
Removing that should put the form button properly below the other content. Furthermore, changing the form rows to 100% width for just those pages will fix the weird floating issue it looks like you've been trying to fix because of the long form titles:
#top.page-id-741 .form-row-first,#top.page-id-741 .form-row-last {
width: 100%;
}
That will ONLY effect that specific page so there won't be any other width extension on other forms.
Regards,
Devin