I canβt say for sure why your tables do not interact correctly without seeing the markup, but I see a problem with your fundamental approach.
Instead of another table, wrap the table in a DIV tag as follows:
<div style="border:solid 1px #990000;"> <your table> </div>
It better complies with modern HTML / XHTML standards.
Without seeing my code, I cannot say whether your internal table adheres to best practices or not.
Hope this helps
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