Narh I just checked, $0 is on the left. This issue is the dev and charity slides start at $0 but the humble slider has a minimum (for me it's $2.67 but I assume it's different for each currency) so when the slider is moved by adjusting one of the other sliders it's just calculated as if the slider is 0-100% instead of something like 5-100%... Pretty easy mistake to make