Coalesced Corruption in Lush Isles gives a negative Modifier but doesn't show one on the label

If you look at your list of remnant modifiers before and after detonating Coalesced Corruption in Lush Isles, you will see that it adds a negative modifier in exchange for its bonus. But, the negative modifier is not displayed on the label in the game world and you have to check your new list of remnant modifiers against what it was prior to marking the coalesced corruption to see what it gave you.