Struggling to read on Adderall

I've been taking Adderall for some time now. I usually struggle to read when I haven't taken ADHD medication. I've noticed that even when I take the Adderall, I still struggle with reading. I have to read the sentences over and over again. It feels like my brain can't process what I'm reading. I struggle with this issue on and off Adderall. Has anyone else experienced this?