Collections And Maximum Count/Length

I am working on a project that requires me to check the number of rows
in a table with the same HTML "ID" value.

I do this in my code with:

i = document.all(rowid).length

However, if the number of rows with the same ID is greater than 8, it
always returns 8 (not 9, 10, etc.)

Also, I am seeing a similiar response in a 2nd page when I attempt to
get the number of elements in the Form collection

i = Request.Form.Count

This also returns a value of 8 although I know there are more elements
in the collection than 8.

Is any one aware of an issue like this? Maybe some kind of setup
issue with IIS?