I'm experiencing some really weird behaviour where setting a custom column field saves different values based on whether the field is displayed or hidden. When hidden, the value gets rounded down to the nearest integer. Anybody seen anything like this before?

what is the field type?

It's a Currency field. I made a bit of progress yesterday. If I have the field as visible and hide it on the form everything works fine. It's on an expense report that is multi-currency. I'm figuring that if it's not on the form then it somehow can't work out the currency precision???