Page down in a large portfolio goes more than a full page, skipping several stocks.
If there are 20 stocks on the first page of a large portfolio, page down goes down about 23 stocks, skipping three stocks. It should only go down 19 stocks so that the bottom of page 1 becomes the top of page 2. That way you know no stocks were skipped.
I agree that this is a problem. I noticed this months ago but it's never been fixed. Should take 5 minutes to fix this error. Needs to go down about 4 rows less when I hit the <space bar> or <page down> in my portfolios. At a minimum, the bottom row on the current screen should be the top row on the next screen after a page down. Pretty simple.
B Norman commented
Your developers should test with large portfolios. It is quite obvious they don't since there are so many annoyances that are only applicable to large portfolios. If features work in large portfolios they are bound to work in small ones, but not vice versa.