Learning about something makes us more aware of it, more prone to see it around us and in ourselves. It’s the same part of the brain that, after buying a new car, causes you to see that model car everywhere now. You can do it with anything about yourself too, really start to learn about how your accent sounds to people who don’t share it, and you’ll start to hear it more in everything you do. I think this is probably very common.
I find it a bit upsetting sometimes. Most of the time I’m not thinking about it, but when I start actually learning about adhd, it makes me feel sort of helpless and incompetent, like all this stuff that doesn’t bother me 90% of the time is suddenly not-normal and ruining my life.