Stir fry broccoli & cauliflower?

I'm a novice chef. Just finished doing a stir fry with broccoli & cauliflower. The broccoli is ok, but it is a little crunchy. The cauliflower is a little crunchy too. Should they still be slightly firm after frying?

Usually when I steam or pressure cook them, they're soft.

What am I doing wrong?
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