I have two CheckboxSetField(s) in one form. Both use a string for the keys. The script is on the dev and live server. On the dev all works as I expected. On the live the first checkbox set makes the values for each field integers corresponding to the array index. Also it makes the first value checked when I don't want it checked. The script is identical on two different servers. What could this be? Running the same silverstripe version on both servers.