When you open the menu what is your input?
I found myself in a situation trying to learn how to get them working. I started with 999999999.0 which morphed into 1.e09 or something. So I kept scaling back a 9 until I ended up with number that didn't disappear when I reopened the menu.
This is exactly what I did:
Open menu, changed first input to 999999999.0 (don't forget the decimal) copy the number onto clipboard.
Uncheck then recheck the item.
Close the menu.
Open the menu, if you see anything other than a string of 9's you'll need to delete the input and paste your clipboard.
Delete 1x '9'. (copy the remaining string to clipboard)
Uncheck then recheck the item.
Close the menu.
Rinse repeat steps 4 - 7 until when you open the menu you see a string of 9's.
Open the item and copy that string to clipboard.
Paste it into the other fields, adding the .0 at the end of all 3 strings/fields.
Uncheck and recheck all items.
Close the menu.
Enjoy/Profit