Allen I just looked at your template at that site. I see no obvious big differences between template except your not using the require statement.
I did notice after running this site through the validator there where multiple invalid tables on this site. The total errors were a whopping 521 so I would think that your seeing the result of those errors graduating down. Thats weird as this hack itself is XHTML COMPLIANT. There is no explanation for what is displaying on that site from this hacks point of view. I see where that $tbclose is not being read. I will look into that part of the hack and see if there is anything that can be done. Mysterious to say the least. I would tend to think that if it misses one tbclose it would miss another.