Some adjectives, such as "concerned" change their meaning according to their position in the sentence.
For example:
<em>Concerned </em>before a noun means "worried" [Cambridge Dictionary] (<em>I'm a bit concerned about/for your health)</em>. However, adopted after a noun means "involved in something or affected by it" [Cambridge Dictionary] (<em>I'd like to thank everyone concerned for making the occasion run so smoothly)</em>
