Can't use my 20 year olds player in my under-20 games

Why can't I use my 20 year old players against Panama? This happened to me when I played against Gibraltar under-20s but I thought something was wrong with Gibraltar. I even played with most of this players in the U-20 World Cup. All my player were born on or after 1 January 1995 so I don't get why I can't play with them (official rules in real life). Even when I take all the 20 year old the game says there is still one on my team.
Here are some pics: