Finger Memory?

I was trying out a typing program the other day and noticed that I had a lot of trouble typing series of letters that didn’t fit the patterns of English. I could fairly easily type something like daf, which followed an expectable consonant-vowel-consonant pattern, but I had trouble with the likes of fja. I’d consistently hit the a first, even when I knew perfectly well it was time for the j.  My left pinky was heading for it before I had a conscious opportunity to hold it back until I’d make it to the j.

I know perfectly well that the brain is capable of this sort of thing, but it never ceases to amaze me.