Do you ever have a habit of always making certain typos?

I mean, if I wanna type something that starts with a hard TH sound like, "that", for some reason, I catch myself wanting to start it with an L instead of a TH.
As of about 10 years ago, I NEVER had a problem with knowing the difference between "here" and "hear". I mean, I know the difference but, for some reason, when I wanna write "here", I'll type, "hear" and vice versa.
If I wanna write, "now", sometimes it comes out, "Know", sometimes it comes out, "no".
Sometimes, I wanna write, "that" and I get, "than" or, "the".
Quite often I never catch these until I proof read and can't understand why I keep making the same mistakes when I know better!

Do you ever have a habit of always making certain typos?
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