It happens. Sometimes people charged with a criminal offense forget about a court appearance and need help “recalling warrants” or striking an Order for Arrest.
You may have even been scared and decided not to appear in court on the assigned date, later realizing that only made a bad situation worse.
It’s also possible to have multiple cases pending in the same or even different jurisdictions, making it hard to keep track of everything. Missing court can happen for a lot of very good reasons and is not terribly unusual.