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This is a result of spaces and line returns between table elements. Where that normally does not have any effect on a table, here on the site it is a no-no.
To fix the problem, edit your entry, and remove all spaces between table elements ... they should look like this:
<TABLE><TR><TD>some text information here</TD></TR> and so on. The only exception is that as you write your entry, some line breaks will occur naturally, put there by the site's software. Do not interfere with these; doing so will delete part of your text.