From googling I found it is a "feature" of CKeditor, I guess they think it helps accessibility/usability for screen readers used by visibility impaired people.
I agree with you, it gets in the way and makes things less accessible/usable for most users. I was able to disable it by configuration so it will be fixed in the new release of mojoPortal coming soon. It is fixed now in the source code repository.
Best,
Joe