Zoom Annotation

My keyboard is working just fine in my iPad chat and in other apps. But it doesn't work in annotation.  When I use the original keyboard in my iPad, it doesn't work properly. When I type 'Hello', The 'o' will disappear. If I type 'Hello, my name is _ZoomUser_',  it will only shows 'Hello, my name is'.  Does anyone knows an answer to these two questions?