Unwanted "br" before each "input" field?

I’m building a form at <https://directory.sustainablesources.org/get-listed/&gt;, and something is inserting a before every <input> field. (Sorry, you have to be logged in to see the form. Feel free to use “sstest” for both username and pass.)

I’ve got Unfiltered MU plugin on it, so it should theoretically be showing my code as I entered it:

<strong>Contact Name: (/strong><input type=text .....

etc. No line breaks anywhere between the field name and the input field. Instead, it’s displaying in firebug as:

<strong>Contact Name: </strong>
<br>
<input type=text .....

(jeez, it’s xhtml transitional. shouldn’t that at least be a <br />?)

Any ideas? Is there an better “don’t mess with my code” plugin than Unfiltered MU? Or any clues as to where in the WP code base they’re inserting the line break? Workarounds?

Thanks.