I have this problem aswell, but what i've noticed is that the ilvl shown is the lowest ilvl in the group, not the ilvl required.

eg.

Ilvl in the column says 546, so you can see it with ilvl 546 and above, because that would qualify you.

But the actual ilvl required might be 550, meaning you're not actually qualified for it.

You can see it in the popup menu on the right as:

ilevel / lowest 550 / 546