Avoiding setSingleStep warning when changing spacing of projection volume node

When I’m changing the spacing of a volume dimension that is only 1 voxel, such as an intensity projection volume, I keep getting warnings like below whenever the spacing is increased. Is there something I can call prior to increasing spacing so that I can avoid this issue?

ctkSliderWidget::setSingleStep() 5.43941 is out of bounds. 18.2257 21.704 19.9649 originates from here.