Item is not red, yet still won't equip

Trying to equip a newly made Nadir helm, when I was using a Nadir skullcap, but it won’t let me. Strength and level requirements met, item appears green when highlighted, not red but still will not equip. Class restriction?

Nadir adds 5 strength. Probably that without this +5 str you cannot wear the new nadir. Take off the current Nadir helm see if the the new one became red

No it was a bug I think. Item appeared green with no helm equipped at all but still wouldn’t equip. However I have added a few more strength since then and now it works. I don’t know.