Yeah, definitely an ADD/Attention-Processing issue. I used to read a lot as a kid, and after a head injury that aggravated my ADD and years of reading and talking in short-form messages (SMS, twitter, etc), it took me FOREVER to re-learn the skill of reading long-form text.
Luckily, with practice comes mastery, I was able to regain my abilities to read, and I’m currently working on a few textbooks and two casual books. It’s still a struggle in distracting environments (loud children, hospitals, etc), but it’s getting better the more I read.
This, many times over, this.