Export function has a bug in it.
The data (Prices) exported is buggy and does not match the data in the Webpage. In other words, you have 90 securities in a portfolio. You can view that portfolio and the downloaded data does not agree with what exists within the webpage. This data discrepancy is not repeatable. If you export it again, it will export the correct data. This is very hard to detect in large portfolios. This is the second week I have noticed this problem. Please look into this. Data accuracy is obviously very important in Finance.