Your picture didn't show LAST. I assume it was blank too?
From what I've seen, it only happens when you initially add the symbols, so if you close the portfolio and re-open it, it should be OK after that. Unfortunately, I have not been able to recreate the issue, which I would need to do in order to fix.
If you see some consistent way to get this to happen, can you please let me know what it is. thanks