It's all those extra /tr /td and /table commands at the end. I could just edit it and strip them out, but I'm leaving them so I can hopefully train the software to handle them.

The problem appears only specifically to be with too many table commands. Unlike most html tags which can be safely completed in any order, table commands need to work from the end of the text back, which is not how the engine works. I'm going to need a very clever exception.