Large glass window wobbles
I have 2 large (~3.5' x ~8') windows on both sides of the fireplace in my new home. The one closest to the door is tempered (required by code). The tempered glass wobbles in the middle of the glass when an exterior door is opened or closed. It is not loose in the frame - it is the middle that wobbles. The normal (plate?) glass does not wobble at all.
Is this a problem with the glass or is this normal for tempered. Builder/window company says it is because it is tempered, but the will replace with normal glass if I want them to.