Cannot tell you what is happening. Tables for layout is a black art that is dieing out...I don't even want to attempt to debug a table layout! I have no idea what is going on with your layout.
Logic without the fatal effects.
All code snippets are licensed under WTFPL.
There were a lot of bugs in tables for layout; that's one reason why no one uses them any more. Back in the 90's the only thing that kept tables in business were the bugs in CSS implementations.
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