Ipad/safari - Composer window moving to top of screen?

Seeing new behavior this morning (Ipad safari), where composer is jumping to the top of the screen for some reason… rather than being anchored to the bottom. I can’t increase the window height. Also when the composer is up there, the buttons (e.g. file upload) don’t work. If I hide the ipad’s bottom toolbar (Screenshot 2) then the composer returns to the bottom and functions like normal.

Any thoughts?