So I am guessing the problem is caused by the h2 tags (with the messy HTML) in this case?
It has nothing to do with the h2 tags, but with the <td> elements that enclose them. You need a </td> after the end of each of them, before the next <td>. (You should probably also have <tr> and </tr> tags to delineate the table rows, but I don't want to get into analyzing the antiquated HTML markup.)

If you copy through a plain text editor to strip all the unnecessary table formatting, then insert <p> and </p> tags around each paragraph and <h2> tags if you want them, you will not have to worry about table rows.
And Google at least (not sure about other search engines) is beginning to factor the quality of the HTML markup into its page rankings. Lots of invalid HTML in your product descriptions as you have them will start to hurt you.