overlapping text in firefox

Hi
I am creating a new page using tables. I am using ATO 3.5.3 and WP 3.0.1.
In IE the site looks fine, but in Firefox some of the tables are overlapping.
I have deleted and re-added the tables, and put spacer html codes between them, and it still is happening.
Any suggestions as to what could be causing this to happen (only in firefox)? And what I can do about this?
It just started happening (the prior tables format fine)
Here is the site page: http://anewconsciousness.org/test-home-page/ - look at it in Firefox to see what I mean.
Thanks
Dona