Values lost or replaced when creating stocks

[ptippett]

Creating stocks sometimes loses values.

For example create a stock with a 3.25% discount, then create the same stock with a 10% discount, and it'll lose the 10% and add more stock to the 3.25% row.
I see the same behavior when changing stock name, maturity, etc, although I did see name and maturity sometimes work correctly and end up in a separate row in the UI, but not consistently.