Are ionized air purifiers safe for my birds?

I have noticed that when I put my air purifier on for long periods of use with the ionizer on in the same room where my birds are, my bird starts to act strange. He suddenly has a night fright type reactions and also chirps differently, runs in a circle on the floor like in a panic or something.

He is a 13 year old lovebird and have never seen him react like this before until I got a new air purifier called Sharp plasmacluster ionizer.

My question is, is my bird being affected by this air cleaner somehow?