iOS 11 accessibility zoom issue

Since iOS 11 update, when I use the triple finger tap zoom option, the zoom only works on the top half of my phone. I can move the zoom box up, down, left, and right but it hits an invisible barrier around the center of my phone and won’t go any lower. Also it hits the right edge of my phone like normal but on the left it keeps going off screen. It appears to be thinking my phone is in landscape mode when in reality it is in portrait mode. Any suggestions on a fix? Thanks.