Are we going to experience this in fc 27?

"Full-back: A wide defender that will prioritise protecting their own goal, by staying back, holding the defensive line, and offering a passing option to release pressure. Defend: when set to defend, the full-back will move inside to form a back three when their team is in possession."

That is what is written in the description for the full-back role with a defend focus, so why is it when I'm defending the wing, my RB will try  pull themselves out to the middle of field trying to play as a central CDM?

"Defender: A no-nonsense center-back who excels at the basics of defending, including maintaining the defensive line. Defend:  when asked to Defend, the defender will focus only on their defensive duties."

That is what is written in the description for the Defender role with a defend focus. So, why is it, when I'm defending the middle of the pitch with my CDM's, my CB tries to pull out, before my opponent has even reached my defensive line?

I use the exact same tactics for UT and online seasons, my UT has ++ roles in near every position. Online seasons, however, over half of my team does not even have a + role in my tactics, yet, the issues mentioned above I only experience on UT. Online seasons, everyone stays in position, when I make a tackle that connects, the opponent is affected (whether it's a loss of possession or a slight stumble), on UT I repeatedly find connected tackles not affecting my opponent in the slightest.