Here's what I see, when I check my "Total Increased" Decay damage
EDIT: I just noticed the values are much higher than on the nodes in the tree (most say 10, but in the tree they're worth 3), so I assume you've already done some calculation "per node" before each individual modifier is shown in this table?
That looks correct; what's showing up there is the generic "Chaos Damage" that is on those nodes, whereas the multiplier (if it actually appeared in such a list) would read "Chaos Dot Multiplier".