What are "dynamic characters" and what does "action rooted to character" mean?

Dear fellow scribes,

I recently got the Black List feedback saying: "The characters are colorful but it's still difficult to connect to them. They could be more dynamic. Further honing them will assist in attracting marquee actors."

The feedback was also saying: "There's a great deal of action that would have more impact if it felt strongly, convincingly rooted to character."

What does this mean actually? Do these two points of criticism actually stem from the same root problem?

And then, are there some examples for particularly dynamic characters in film / TV or where the action is rooted strongly to a character?

Thank you so much for the help!