If you go back and look at early examples of my handwriting, every "S" was backwards, my b and d were often flipped the wrong way, as were my p and q.
My spelling was atrocious, but my vocabulary was way above average.
I also had the issue with transposing numbers while doing math.
It wasn't until I reached High School that I had a teacher who recognized dyslexia when he saw it.
One of my relations wrote completely mirrored for a time, that was interesting. It did make me wonder if their brain was flipping the entire World; they've corrected it now. It reminded me of, da Vinci, who I think write in mirror writing for himself but used regular writing when writing for others.
I still have to double take on "invertebrate", because I originally read it as "intervertebrate" or something like that :).