Hi Chad,
There seems to be a glitch in the VolumeCandle RTX. It looks like VolumeCandle does not recalculate Volume Title correctly when Inside Body Merge Layer is used. It seems to recalculate Delta Title (not sure 100% if the math is correct), but Volume stays the same upon bars merging. If I Shift+click chart recalc button (chart down right), then Volume Title changes and reflects correct volume for merged bars. Probably the easiest way to see this is to use volume periodicity, say 2000v + IBOD.