Multiple Textarea error at editing

Hi there, i’ve installed wordpress version 2.3.1 an when in a page i include more than one textarea and publish it, when i go to edit that page i can only edit and sabe what is before the second textarea, i havent investigates more about this and i have made some “improvements” in the source so maybe you want to check it out before considering it as a bug.
I’m using a modified version of default as a theme.
I hope you understand my english.
Best reggards