When I run the upgrade finder all the mythic world drop items are listed starting at 905 but in game the base ilvl is 900 for mythic world drops. Doing some looking I also noticed this was true of the heroic and normal world drop stuff as well base level is actually 885 and 870 but AMR has it at 890 and 875. I didn’t check raid finder but I suspect it may be the same. A work around is to select the difficulty lower and edit the item directly to get accurate comparisons with your currently equipped item but it would be nice if this was fixed so it would give a more real world result when using the upgrade finder.
You think I would have noticed this because I’ve gotten like 10 of those cloaks in-game… yeah we can change that in the next update.