Auto-scrolling (maybe not the right term) disabled on my phone after switch to advanced text editor.

Two days ago I switched to advanced text editor so I could better insert code. Since then when posting from my phone it's stopped auto-scrolling. Not sure if this is the correct term- what I mean is the text field no longer moves to keep the words I'm typing in view on the iphone screen, I have to manually move it (or zoom way out). Anyone else having this issue? Is the only solution to go back to the simple editor?