I was checking the upgrade finder for my disc priest today, since I would like to play the priest sometimes in a random raid as a healer, and in the upgrade finder it clearly recommended me items that are much lower of item level than my main hand (Having equipped: Tusk of the Reborn Prophet (370 iLevel) - Recommended Upgrade: Tusk of the Reborn Prophet (355 iLevel))
In the two pictures I added you can also see my current gear and the information I got from the upgrade finder.
Hoping that someone could explain me why this happens. First time I encounter that problem.
Thank you very much for the help!